Avoid spawning a new server for --show-stats

[glandium]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (22f5a0a) 30.94% compared to head (3e6f373) 30.83%.

❗ Current head 3e6f373 differs from pull request most recent head 0aad719. Consider uploading reports for the commit 0aad719 to get more accurate results

Files	Patch %	Lines
src/server.rs	36.84%	5 Missing and 7 partials ⚠️
src/commands.rs	0.00%	0 Missing and 7 partials ⚠️
tests/harness/mod.rs	40.00%	0 Missing and 3 partials ⚠️
tests/sccache_cargo.rs	0.00%	0 Missing and 2 partials ⚠️
src/cache/disk.rs	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2059      +/-   ##
==========================================
- Coverage   30.94%   30.83%   -0.12%     
==========================================
  Files          52       52              
  Lines       19720    19749      +29     
  Branches     9493     9506      +13     
==========================================
- Hits         6103     6089      -14     
- Misses       7915     7930      +15     
- Partials     5702     5730      +28     

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