Make SQL Metricbeat GA.

[lalit-satapathy]

Upgrade SQL Metricbeat to GA

What does this PR do?

Removes Beta tags

Why is it important?

#34623

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Checklist

NA

Related issues

• Closes #34623

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @lalit-satapathy? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-03-06T05:47:28.040+0000

• Duration: 67 min 29 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4566
Skipped	1006
Total	5572

💚 Flaky test report

Tests succeeded.

🤖 GitHub comments

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[muthu-mps]

Same as the above.

[muthu-mps]

LGTM!