PMM-13932: Add Environment filter to MySQL Replication Summary

[mattiasimonato]

Ticket number: PMM-13932

Feature build: SUBMODULES-4471

Adds the Environment dropdown to the MySQL Replication Summary dashboard, filters Replication Set and Service Name by the selected environment, and enables multi-select for all three filters.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.02%. Comparing base (31318c7) to head (0543131).
⚠️ Report is 64 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5647      +/-   ##
==========================================
- Coverage   43.59%   37.02%   -6.57%     
==========================================
  Files         415      215     -200     
  Lines       43134     7160   -35974     
  Branches        0      585     +585     
==========================================
- Hits        18804     2651   -16153     
+ Misses      22454     4314   -18140     
+ Partials     1876      195    -1681     

Flag	Coverage Δ
admin	34.94% <ø> (+0.15%)	⬆️
agent	?
managed	?
unittests	41.29% <ø> (?)
vmproxy	?

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[Copilot]

Pull request overview

This PR updates the MySQL Replication Summary Grafana dashboard to add an Environment filter and make the top-level dashboard filters multi-select, so users can narrow down Replication Set and Service Name options by environment.

Changes:

• Added an Environment template variable (dropdown) based on label_values(mysql_up, environment).
• Updated the Replication Set and Service Name variable queries to be filtered by the selected environment.
• Enabled multi-select for Environment, Replication Set, and Service Name variables, and removed the previously hidden Environment variable definition.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.