Added tests cases for IdSet VirtualTable (backport #7260) [release/4.11.x]

[mergify]

imodel-native: iTwin/imodel-native#987

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This is an automatic backport of pull request #7260 done by Mergify.

[mergify]

Cherry-pick of 8683f7e has failed:

On branch mergify/bp/release/4.11.x/pr-7260
Your branch is up to date with 'origin/release/4.11.x'.

You are currently cherry-picking commit 8683f7e430.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   common/changes/@itwin/core-backend/Soham-AddingTestsForIdSetVT_2024-10-14-13-05.json
	modified:   core/backend/src/test/ecdb/ECSqlQuery.test.ts
	modified:   core/backend/src/test/ecdb/ECSqlReader.test.ts
	modified:   core/backend/src/test/ecdb/ECSqlStatement.test.ts
	new file:   core/backend/src/test/ecsql/queries/IdSetVTTests.ecsql.md
	new file:   docs/learning/ECSqlReference/IdSet.md
	modified:   docs/learning/ECSqlReference/index.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   common/config/rush/pnpm-lock.yaml
	both modified:   core/backend/package.json
	both modified:   core/backend/src/test/ecsql/queries/Misc.ecsql.md
	both modified:   test-apps/display-test-app/android/imodeljs-test-app/app/build.gradle
	both modified:   test-apps/display-test-app/ios/imodeljs-test-app/imodeljs-test-app.xcodeproj/project.pbxproj
	both modified:   tools/internal/ios/core-test-runner/core-test-runner.xcodeproj/project.pbxproj

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally