revert: "fix: Added iFrame to load Base64 PDF data in document viewer widget"

[techbhavin]

Reverts #10770

Test coverage results 🧪

🔴 Total coverage has decreased

// Code coverage diff between base branch:release and head branch: revert-10770-fix/pdf-document-viewer 

Status	File	% Stmts	% Branch	% Funcs	% Lines
🔴	total	55 (0)	36.48 (-0.01)	34.71 (0)	55.4 (0)
🔴	app/client/src/utils/WorkerUtil.ts	89.76 (0)	70.59 (-1.96)	100 (0)	93.33 (0)
🔴	app/client/src/utils/autocomplete/TernServer.ts	52.71 (-0.23)	40.83 (-0.84)	36.21 (0)	56.74 (-0.25)
🟢	app/client/src/widgets/DocumentViewerWidget/component/index.tsx	40.37 (-1.16)	45.65 (4.83)	16.67 (0)	42.11 (-1.16)

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[techbhavin]

/ok-to-test sha=4b3a37f

[github-actions]

Tests running at: https://github.com/appsmithorg/appsmith/actions/runs/1777485698.
Workflow: Appsmith External Integration Test Workflow.
Commit: 4b3a37f.
PR: 10786.

[somangshu]

@techbhavin please check the original issue in the DP once its ready. We can merge then

[github-actions]

UI Performance test run logs and artifacts: https://github.com/appsmithorg/appsmith/actions/runs/1777485698.
Commit: 4b3a37f.
Results:

Click to view performance test results

	Run 1	Run 2	Run 3	Run 4	Run 5	Mean	SD.Sample	SD.Population
Click on table row
scripting	2254.69	2558.74	2099.5	2075.9	2050.78	2207.92	9.58	8.57
painting	21.07	51.12	9.12	14.05	15.23	22.12	75.77	67.77
rendering	333.91	418.45	252.59	318.79	232.84	311.32	23.63	21.14
Edit input
scripting	334.54	276.05	321.01	316.82	339.07	317.5	7.85	7.02
painting	10.42	16.55	12.55	40.68	16.12	19.26	63.55	56.85
rendering	19.82	13.65	23.34	16.49	21.39	18.94	20.49	18.32
Clear input
scripting	731.65	807.8	687.51	734.35	763.22	744.91	5.96	5.33
painting	9.03	6.65	9.23	9.51	6.51	8.19	18.07	16.12
rendering	176.65	192.12	172.94	224.13	186.3	190.43	10.67	9.54
Edit input again
scripting	300.55	300.85	296.35	341.26	292.81	306.36	6.46	5.78
painting	6.09	16.07	4.3	7.17	9.41	8.61	52.96	47.39
rendering	27.62	27.54	20.34	27.42	24.08	25.4	12.60	11.26