support-multi-version-dashboard

[qiffang]

What problem does this PR solve?

• Support multi TiDB Cluster dashboard version, default use v2
• Remove gzip logic because it is too difficult to maintain
  Note
  In Grafana, the symbol "{{" represent a grammar, it conflict with helm grammar, {{ should be replaced by {{{{}}
• Support multi version binlog dashboard

What is changed and how it works?

Based on the image version to decide dashboard version and binlog version

Check List

Tests

• V3 TiDB Cluster - PASS
• V2 TiDB Cluster - PASS
• Binlog dashboard - PASS

Code changes

• Has Helm charts change

Side effects

• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch

[tennix]

LGTM, it works for me. In the future, I think it's better to re-package grafana image to follow TiDB version.

[qiffang]

LGTM, it works for me. In the future, I think it's better to re-package grafana image to follow TiDB version.

Yes, this approach is only a temporary workaround. After a while, we need to discuss a graceful solution.