[OP#41102] link workpackage backend

[individual-it]

ability to link files to packages, backend for #64
manually tested with https://github.com/opf/openproject/tree/feature/file-links

[individual-it]

restoreAllMocks in afterEach seems not to be enough
Without this some tests would pass when running all tests of the file but fail if ran single

[individual-it]

CC @Kharonus @wielinde I cannot add you as reviewers

[github-actions]

JS Code Coverage

Coverage after merging addLinkToWorkpackageBackend into master will be

46.79%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
utils.js	8.33%	0%	0%	14.29%	3–9, 9
src/components
AdminSettings.vue	40.91%	100%	16.67%	50%	74–76, 80, 87–88, 90, 93
OAuthConnectButton.vue	92.59%	100%	83.33%	95.24%	34
PersonalSettings.vue	33.33%	26.32%	27.27%	38.89%	102–103, 103, 103, 106–107, 107, 107, 110–111, 111, 111, 114, 117–118, 120–121, 121–123, 123, 123, 123–124, 129–130, 130, 130, 135, 141, 89–92, 98–99
src/components/settings
SettingsTitle.vue	0%	100%	0%	0%	14
src/components/tab
EmptyContent.vue	100%	100%	100%	100%
SearchInput.vue	63.37%	43.75%	66.67%	67.14%	101, 101, 101, 144, 152–156, 161–165, 165, 165, 165–166, 181, 183–184, 186, 188–189, 189, 189, 66, 93, 93, 93–94, 96
WorkPackage.vue	100%	100%	100%	100%
src/views
Dashboard.vue	0%	0%	0%	0%	101, 106, 106, 106–107, 109, 115, 119–120, 128, 131, 135–137, 139, 142–143, 146–147, 147–148, 152–153, 153–154, 156, 158–159, 159, 159, 159, 159–161, 161, 161, 161, 161–163, 166, 171, 171, 171, 173–174, 174, 174–175, 177, 177–179, 183, 187, 190, 190, 190, 193, 193, 193, 198, 201, 201, 201, 208, 211, 211, 211, 216, 216, 216, 22, 221, 221, 221, 226, 229, 23, 232, 235, 235, 235, 238, 238, 238, 24, 241, 244, 247, 25–30, 47, 54, 54, 61, 64–65, 77–78, 78, 78, 81, 84, 84, 84–86, 86, 86–88, 88–89, 91, 94, 94, 94–96, 96, 96–98, 98–99
ProjectsTab.vue	82.22%	80%	85.71%	82.14%	100, 100, 100–101, 103, 89–90

[github-actions]

PHP Code Coverage

Coverage after merging addLinkToWorkpackageBackend into master will be

46.10%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
lib/AppInfo
Application.php	0%	100%	0%	0%	49, 51–52, 54–55, 59–60, 63, 70, 74–77, 79–84, 95, 99
lib/BackgroundJob
CheckNotifications.php	0%	100%	0%	0%	48, 50, 52–53, 61–62
lib/Controller
ConfigController.php	63.64%	100%	60%	63.86%	101–102, 104, 115–116, 118, 216–221, 223–226, 228, 230, 81–82, 84, 86–88, 90–95
OpenProjectAPIController.php	74.39%	100%	75%	74.32%	170, 187–188, 191, 194–199, 204, 206–211, 213, 90
lib/Dashboard
OpenProjectWidget.php	0%	100%	0%	0%	106–109, 61–64, 71, 78, 85, 92, 99
lib/Exception
OpenprojectErrorException.php	100%	100%	100%	100%
OpenprojectResponseException.php	0%	100%	0%	0%	16
lib/Listener
LoadSidebarScript.php	0%	100%	0%	0%	59–61, 65–66, 68, 70, 72–74, 76–78
lib/Notification
Notifier.php	0%	100%	0%	0%	100–104, 109–110, 112, 114, 47–50, 60, 69, 80, 82, 85, 87–92, 95, 97
lib/Search
OpenProjectSearchProvider.php	0%	100%	0%	0%	102, 109–110, 113–116, 118–119, 123–125, 127–131, 133–135, 138–139, 141–142, 146–147, 149–151, 157–158, 160, 169, 177–183, 192–197, 206, 71–75, 82, 89, 97, 99
OpenProjectSearchResultEntry.php	100%	100%	100%	100%
lib/Service
OpenProjectAPIService.php	68.33%	100%	70.59%	68.14%	106–107, 116–125, 127–130, 133–138, 140–141, 144–145, 161–165, 175–176, 178–182, 184, 193–197, 392–393, 395, 410–413, 415, 483–484, 491, 494–497, 499, 505, 509–511, 682
lib/Settings
Admin.php	0%	100%	0%	0%	25–26, 33–35, 37, 42–43, 47, 51
AdminSection.php	0%	100%	0%	0%	19–20, 29, 39, 48, 55
Personal.php	0%	100%	0%	0%	38–41, 48–52, 55, 57, 59–61, 65–66, 70, 74
PersonalSection.php	0%	100%	0%	0%	19–20, 29, 39, 48, 55