fix: correct CustomerGirdFilterPool virtualType typo

[lbajsarowicz]

Summary

Fixes a typo in CustomerGirdFilterPool virtualType name (missing "d" → should be CustomerGridFilterPool).

Related: #40500, #38244 (both closed without merge)

Changes

• Renamed CustomerGirdFilterPool → CustomerGridFilterPool
• Added deprecated backward-compatible alias CustomerGirdFilterPool → CustomerGridFilterPool for third-party modules
• Updated internal reference to use the corrected name

Test plan

• Verify Customer grid loads correctly in admin
• Verify filters work on customer listing page
• Confirm no DI compilation errors: bin/magento setup:di:compile

⭐ Support my work

Do you like the fix? Remember to react with "👍🏻" to get it merged faster,
Then Sponsor me on Github so I can spend more time on fixing issues like this one.

Learn more at https://github.com/sponsors/lbajsarowicz

[m2-assistant]

Hi @lbajsarowicz. Thank you for your contribution!
Here are some useful tips on how you can test your changes using Magento test environment.
❗ Automated tests can be triggered manually with an appropriate comment:

• @magento run all tests - run or re-run all required tests against the PR changes
• @magento run <test-build(s)> - run or re-run specific test build(s)
  For example: @magento run Unit Tests

<test-build(s)> is a comma-separated list of build names.

Allowed build names are:

1. Database Compare
2. Functional Tests CE
3. Functional Tests EE
4. Functional Tests B2B
5. Integration Tests
6. Magento Health Index
7. Sample Data Tests CE
8. Sample Data Tests EE
9. Sample Data Tests B2B
10. Static Tests
11. Unit Tests
12. WebAPI Tests
13. Semantic Version Checker

You can find more information about the builds here
ℹ️ Run only required test builds during development. Run all test builds before sending your pull request for review.

---

For more details, review the Code Contributions documentation.
Join Magento Community Engineering Slack and ask your questions in #github channel.

[lbajsarowicz]

@magento run all tests