Fix part of #10474: Enables strict typescript checks for some files - (2.2)

[mridul-netizen]

Overview

1. This PR fixes or fixes part of Make typescript checks strict #10474 .
2. This PR does the following: [Make Typescript checks strict for some files]

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• The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
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Proof that changes are correct

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Files Covered

1.      "core/templates/pages/exploration-editor-page/translation-tab/services/translation-language.service.ts",
2.      "core/templates/pages/exploration-editor-page/translation-tab/services/translation-language.service.spec.ts",
3.      "core/templates/domain/story/story-validation.service.ts",
4.      "core/templates/domain/story/story-validation.service.spec.ts",
5.      "core/templates/domain/improvements/task-entry.model.ts",
6.      "core/templates/domain/improvements/task-entry.model.spec.ts",
7.      "core/templates/components/state-editor/state-editor-properties-services/state-written-translations.service.ts",
8.      "core/templates/components/state-editor/state-editor-properties-services/state-solicit-answer-details.service.ts",
9.      "core/templates/components/state-editor/state-editor-properties-services/state-recorded-voiceovers.service.ts",
10.     "core/templates/components/state-editor/state-editor-properties-services/state-param-changes.service.ts",
11.     "core/templates/components/state-editor/state-editor-properties-services/state-param-changes.service.spec.ts",
12.     "core/templates/components/state-editor/state-editor-properties-services/state-next-content-id-index.service.ts",
13.     "core/templates/components/state-editor/state-editor-properties-services/state-interaction-id.service.ts",
14.     "core/templates/components/state-editor/state-editor-properties-services/state-interaction-id.service.spec.ts",
15.     "core/templates/components/state-editor/state-editor-properties-services/state-hints.service.ts",
16.     "core/templates/components/state-editor/state-editor-properties-services/state-hints.service.spec.ts", 
17.     "core/templates/components/state-editor/state-editor-properties-services/state-customization-args.service.ts",
18.     "core/templates/components/state-editor/state-editor-properties-services/state-content.service.ts",
19.     "core/templates/domain/collection/search-explorations-backend-api.service.ts",
20.     "core/templates/domain/collection/search-explorations-backend-api.service.spec.ts",
21.     "core/templates/domain/collection/collection-rights-backend-api.service.ts",
22.     "core/templates/domain/collection/collection-rights-backend-api.service.spec.ts",
23.     "core/templates/domain/classroom/classroom-backend-api.service.ts",
24.     "core/templates/domain/classroom/classroom-backend-api.service.spec.ts",
25.     "core/templates/domain/admin/admin-backend-api.service.ts",
26.     "core/templates/domain/admin/admin-backend-api.service.spec.ts",
27.     "extensions/rich_text_components/Video/directives/oppia-noninteractive-video.component.ts",
28.     "extensions/rich_text_components/Video/directives/oppia-noninteractive-video.component.spec.ts",
29.     "extensions/rich_text_components/Link/directives/oppia-noninteractive-link.component.ts",
30.     "extensions/rich_text_components/Link/directives/oppia-noninteractive-link.component.spec.ts",
31.     "core/templates/pages/exploration-editor-page/editor-tab/services/solution-validity.service.ts",
32.     "core/templates/pages/exploration-editor-page/editor-tab/services/solution-validity.service.spec.ts"
33.     "extensions/classifiers/classifiers-extension.constants.ajs.ts",
34.     "core/templates/domain/platform_feature/platform-feature-backend-api.service.ts",
35.     "core/templates/domain/platform_feature/platform-feature-backend-api.service.spec.ts",

PasteBin to Errors - link

[vojtechjelinek]

Thanks! One last small nit.

[vojtechjelinek]

Suggested change

	// A nodeId can be undefined if the nodesQueue(pending nodes to visit)
	// A nodeId will be undefined if the pending nodes to visit are not present.

[mridul-netizen]

done

[oppiabot]

Hi @mridul-netizen, the build of this PR is stale and this could result in tests failing in develop. Please update this pull request with the latest changes from develop. Thanks!

[oppiabot]

Unassigning @nithusha21 since they have already approved the PR.

[vojtechjelinek]

LGTM!

[oppiabot]

Unassigning @vojtechjelinek since they have already approved the PR.

[mridul-netizen]

@kevintab95 @srijanreddy98 PTAL

[oppiabot]

Hi @mridul-netizen. Due to recent changes in the "develop" branch, this PR now has a merge conflict. Please follow this link if you need help resolving the conflict, so that the PR can be merged. Thanks!

[oppiabot]

Unassigning @srijanreddy98 since they have already approved the PR.

[kevintab95]

LGTM for codeowner files. Thanks @mridul-netizen!

[oppiabot]

Unassigning @kevintab95 since they have already approved the PR.