feat(slow-query): support slow query search by digest

[baurine]

Changes

1. Support search slow query by digest filter
2. Expand the TopSQL select instances component width
3. Handle the compatibility issues when querying TiCDC and TiProxy components under TiDB 7.6.0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (473bf80) 9.02% compared to head (b139075) 24.04%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1636       +/-   ##
===========================================
+ Coverage    9.02%   24.04%   +15.02%     
===========================================
  Files         127      173       +46     
  Lines       13365    15679     +2314     
===========================================
+ Hits         1206     3770     +2564     
+ Misses      12028    11626      -402     
- Partials      131      283      +152     

Flag	Coverage Δ
backend_integration	9.02% <ø> (ø)
backend_ut	26.28% <ø> (?)

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