[MSSQL] TSDB enabled release.

[ritalwar]

• Enhancement

What does this PR do?

This PR enables beta testing of MSSQL package for TSDB. The package has been already migrated with dimension and metric type mapping. Here it enables index_mode: "time_series" for MSSQL performance and transaction_log data stream and also upgrades stack version to 8.8.0.

Package version made -beta to avoid accidental use from other users.

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.
• I have verified that Kibana version constraints are current according to guidelines.

How to test this PR locally

Load 8.8.0+ stack
Add mssql config.
Load latest package locally/cloud and follow detailed testing plan.

Related issues

• Relates [Meta][TSDB] TSDB Release for multiple packages #6152

[elasticmachine]

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• Start Time: 2023-06-26T07:40:04.203+0000

• Duration: 17 min 0 sec

Test stats 🧪

Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚 2.769
Classes	100.0% (2/2)	💚 2.769
Methods	93.75% (30/32)	👍 0.61
Lines	100.0% (1251/1251)	💚 8.415
Conditionals	100.0% (0/0)	💚

[botelastic]

Hi! We just realized that we haven't looked into this PR in a while. We're sorry! We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!

[lalit-satapathy]

LGTM

[elasticmachine]

Package microsoft_sqlserver - 2.1.0 containing this change is available at https://epr.elastic.co/search?package=microsoft_sqlserver