feat: fork templates inside an existing app

[akash-codemonk]

Same as the original PR which has been reviewed.

The only new addition is #17038 which has been reviewed.

Description

Templates phase 2

Previously templates were forkable only to an existing organisation as a new app. With this new feature templates can be forked inside an existing app(or merge to an existing app as in all pages of the template are added to the current app).

test.mov

Epic link: #13005

Fixes #14446
Fixes #15912
Fixes #14449
Fixes #14446
Fixes #14447
Fixes #14450
Fixes #15745
Fixes #15879

Changes:

• A lot of the code changes involve making the existing templates ui reusable as the layout is almost the same as the one in the templates tab(which is in prod already).
• We also add a new page context menu when clicked on + icon.
• Tweaks to UI of existing templates tab.
• We have removed the templates notification banner which was first added when templates was added.
• Remove widgets from the templates filter list.
• There is no /generate-page route but there is a /generate-page/form route as before. /generate-page is used on release to show a blank canvas. With this MR there is no separate route for a blank page, we show the empty canvas along with the two cards at the top.
• ReconnectDatasourceModal is made available to use inside the app. This is shown when we import/fork an app/template with datasources that need to authorised. This was done outside an application but now since template can be forked inside an app this is required. When performed inside the app we want the navigation to happen to a particular page instead of the default page of the application, so I have added a new action setPageIdForImport to set the page where we want to be navigated to.
• Small change in widget pasting where I have a check for /generate-page path as it does not exist in this PR. This condition was there as we wanted to paste widgets to the canvas when the user was on that route.
• Removed GitErrorPopup from ReconnectModal which was causing tests to fail as there were two modal for GitErrorPopup at the same time. The GitErrorPopup is only shown when have conflicts during a pull. It is likely we forgot to remove this from the ReconnectModal

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Cypress test which tests forking the template.
QA tested

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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Name	Status	Preview	Updated
appsmith	✅ Ready (Inspect)	Visit Preview	Sep 30, 2022 at 4:51AM (UTC)

[akash-codemonk]

/ok-to-test sha=3459b21

[github-actions]

Tests running at: https://github.com/appsmithorg/appsmith/actions/runs/3152175528.
Workflow: Appsmith External Integration Test Workflow.
Commit: 3459b21.
PR: 17184.

[akash-codemonk]

/ok-to-test sha=6e89103

[github-actions]

Tests running at: https://github.com/appsmithorg/appsmith/actions/runs/3156409492.
Workflow: Appsmith External Integration Test Workflow.
Commit: 6e89103.
PR: 17184.

[github-actions]

UI Performance test run logs and artifacts: https://github.com/appsmithorg/appsmith/actions/runs/3156409492.
Commit: ``.
Results:

Click to view performance test results

	Run 1 (ms)	Run 2 (ms)	Run 3 (ms)	Run 4 (ms)	Run 5 (ms)	Minimum (ms)	Median (ms)	Mean (ms)	Range (%)	SD.Sample (%)	SD.Population (%)
SELECT_WIDGET_MENU_OPEN
scripting	1036.53	1311.76	916.21	958.17	1037.85	916.21	1036.53	1052.1	37.60	14.66	13.11
painting	6.12	21	5.33	5.44	6.47	5.33	6.12	8.87	176.66	76.66	68.55
rendering	700.96	908.74	633.21	636.95	717.66	633.21	700.96	719.5	38.29	15.60	13.96
SELECT_WIDGET_SELECT_OPTION
scripting	167.22	264.74	156.71	190.94	173.19	156.71	173.19	190.56	56.69	22.72	20.32
painting	3.56	20.13	7.18	6.2	3.55	3.55	6.2	8.12	204.19	84.98	75.99
rendering	328.47	468.58	315.74	347.26	336.64	315.74	336.64	359.34	42.53	17.30	15.47
SELECT_CATEGORY
scripting	575.09	346.69	361.72	344.59	424.47	344.59	361.72	410.51	56.15	23.77	21.26
painting	10.52	4.74	4.25	3.38	8.18	3.38	4.74	6.21	114.98	48.63	43.48
rendering	198.91	103.73	104.86	105.18	129.21	103.73	105.18	128.38	74.14	31.82	28.46
BIND_TABLE_DATA
scripting	1699.38	1103.72	1097.3	1070.14	1106.25	1070.14	1103.72	1215.36	51.77	22.29	19.94
painting	21.54	14.62	15	16.82	23.1	14.62	16.82	18.22	46.54	21.30	19.05
rendering	619.68	818.1	814.54	811.44	899.13	619.68	814.54	792.58	35.26	13.04	11.66
CLICK_ON_TABLE_ROW
scripting	1077.58	803.38	898.19	897.44	1350.03	803.38	898.19	1005.32	54.38	21.56	19.29
painting	13.93	9.69	10.18	17.69	11.34	9.69	11.34	12.57	63.64	26.25	23.47
rendering	333.75	300.66	308.89	301.05	327.56	300.66	308.89	314.38	10.53	4.89	4.37
UPDATE_POST_TITLE
scripting	1624.37	1321.61	1309.82	1460.66	1632.53	1309.82	1460.66	1469.8	21.96	10.65	9.53
painting	18.02	13.54	13.8	17.74	19.11	13.54	17.74	16.44	33.88	15.69	14.05
rendering	678.62	590.61	595.8	617.28	659.05	590.61	617.28	628.27	14.01	6.20	5.55
OPEN_MODAL
scripting	692.95	449.87	443.89	450.4	508.3	443.89	450.4	509.08	48.92	20.84	18.64
painting	15.3	8.91	8.5	9.34	15.9	8.5	9.34	11.59	63.85	31.75	28.39
rendering	1555.31	1180.34	1178.38	1189.05	1261.53	1178.38	1189.05	1272.92	29.61	12.69	11.35
CLOSE_MODAL
scripting	354.82	220.18	645.77	226.25	264.83	220.18	264.83	342.37	124.31	51.97	46.48
painting	7.81	14.58	7.82	7.75	7.21	7.21	7.81	9.03	81.62	34.44	30.79
rendering	1019.07	891.38	898.74	888.66	936.01	888.66	898.74	926.77	14.07	5.93	5.31