chore: Initialize logging early and print version at startup

[jannfis]

What does this PR do / why we need it:

This PR moves logging initialization to be the first thing on startup of both agent and principal, so that even a non-starting pod (i.e. due to missing certificates) will log its version information before any error aborts the execution.

Which issue(s) this PR fixes:

Fixes #?

How to test changes / Special notes to the reviewer:

Checklist

• Documentation update is required by this PR (and has been updated) OR no documentation update is required.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.25%. Comparing base (3e7bb73) to head (d4799c1).

Files with missing lines	Patch %	Lines
cmd/argocd-agent/agent.go	0.00%	13 Missing ⚠️
cmd/argocd-agent/principal.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #846      +/-   ##
==========================================
- Coverage   45.27%   45.25%   -0.02%     
==========================================
  Files         118      118              
  Lines       16633    16635       +2     
==========================================
- Hits         7530     7528       -2     
- Misses       8410     8413       +3     
- Partials      693      694       +1     

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