feat: add runner event metrics

[zirain]

Add runner_event_total show the events count the runner received, with following labels:

• name: the runner name
• type: update or delete

[netlify]

✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

Name	Link
🔨 Latest commit	2178800
🔍 Latest deploy log	https://app.netlify.com/projects/cerulean-figolla-1f9435/deploys/69e6e9c45ef8b1000894315a

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 74.44%. Comparing base (56cc3f7) to head (2178800).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/infrastructure/runner/runner.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8802   +/-   ##
=======================================
  Coverage   74.43%   74.44%           
=======================================
  Files         245      245           
  Lines       38973    38985   +12     
=======================================
+ Hits        29010    29022   +12     
- Misses       7960     7962    +2     
+ Partials     2003     2001    -2     

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