cluster,dm: replace ENV_LABELS_ENV in prometheus rules

[9547]

What problem does this PR solve?

fix #990

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[lucklove]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lucklove

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[lucklove]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 32108d4

[codecov-io]

Codecov Report

Merging #1238 (f9e4ed0) into master (4d5347d) will decrease coverage by 17.48%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master    #1238       +/-   ##
===========================================
- Coverage   53.42%   35.93%   -17.49%     
===========================================
  Files         289      224       -65     
  Lines       20625    16287     -4338     
===========================================
- Hits        11019     5853     -5166     
- Misses       7885     9397     +1512     
+ Partials     1721     1037      -684     

Flag	Coverage Δ
cluster	35.93% <0.00%> (-9.08%)	⬇️
dm	?
integrate	35.93% <0.00%> (-11.95%)	⬇️
playground	?
tiup	?
unittest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cluster/spec/prometheus.go	59.76% <0.00%> (-20.48%)	⬇️
pkg/repository/store/store.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/utils/diff.go	0.00% <0.00%> (-87.50%)	⬇️
pkg/repository/utils/hash.go	0.00% <0.00%> (-81.82%)	⬇️
pkg/meta/err.go	0.00% <0.00%> (-81.25%)	⬇️
pkg/telemetry/meta.go	0.00% <0.00%> (-80.00%)	⬇️
pkg/telemetry/scrub.go	6.66% <0.00%> (-80.00%)	⬇️
pkg/cluster/api/error.go	0.00% <0.00%> (-80.00%)	⬇️
pkg/cluster/task/update_meta.go	0.00% <0.00%> (-80.00%)	⬇️
pkg/repository/store/local.go	0.00% <0.00%> (-76.48%)	⬇️
... and 171 more

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