[O11y][MySQL] Update system test cases

[ali786XI]

• Enhancement

What does this PR do?

• This PR updates system test cases for the MySQL package.
• System tests are done in the supported versions mentioned in the variants.yml due to this issue.
  Conversation for the same:- Link
• Updated sample_event.json for the performance data stream.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.

How to test this PR locally

• Clone integrations repo.
• Install elastic-package locally.
• Start elastic stack using elastic-package.
• Move to integrations/packages/mysql directory.
• Run the following command to run the system tests. elastic-package test system

Related issues

• Closes Write system test cases for performance data stream of Mysql #4372

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💚 CLA has been signed

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💚 Build Succeeded

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Build stats

• Start Time: 2023-05-31T13:59:50.958+0000

• Duration: 23 min 14 sec

Test stats 🧪

Test	Results
Failed	0
Passed	63
Skipped	0
Total	63

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚
Classes	100.0% (2/2)	💚
Methods	92.857% (26/28)	❕
Lines	93.706% (134/143)	❕
Conditionals	100.0% (0/0)	💚

[harnish-elastic]

LGTM!

[ritalwar]

LGTM!

[elasticmachine]

Package mysql - 1.12.1 containing this change is available at https://epr.elastic.co/search?package=mysql