[DBMON-5405] Update Mysql integration to use TagManager

[eric-weaver]

What does this PR do?

Updates the mysql integration check to make use of TagManager class rather than keeping track of multiple tag lists.

Notable changes

• Removes the concept of two sets of tag lists where we were keeping a second list that excluded dd.internal.resource tags only from submission of database_instance metadata events. This is no longer needed as the backend now filters these out itself so this simplifies the integration.
• Adds dbms_flavor tag to database_instance metadata events. This fixes a bug where this tag would be missing on any metric or event that relied on Unified Tagging linking
• Overall it simplifies our ability to add / update and replace tags as the values they are derived from change which will help lead to more accurate tags on metrics and events

Motivation

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

Attention: Patch coverage is 97.56098% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.09%. Comparing base (095c770) to head (e6c4691).
Report is 7 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
confluent_platform	?
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
mysql	89.30% <97.56%> (+0.15%)	⬆️
presto	?
solr	?
tomcat	?
weblogic	?

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