✨ Use x509.CertPools instead of PEM strings

[tmshort]

Fixes#999

Description

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

Attention: Patch coverage is 56.81818% with 19 lines in your changes missing coverage. Please review.

Project coverage is 72.63%. Comparing base (bfc65ee) to head (8c148f2).

Files	Patch %	Lines
internal/httputil/httputil.go	50.00%	10 Missing and 6 partials ⚠️
cmd/manager/main.go	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #1052 +/- ##
==========================================
- Coverage 72.98% 72.63% -0.36% 
==========================================
Files 28 28 Lines 1877 1889 +12 ==========================================
+ Hits 1370 1372 +2 - Misses 375 381 +6 - Partials 132 136 +4 

Flag	Coverage Δ
e2e	54.19% <56.81%> (-0.15%)	⬇️
unit	45.36% <6.81%> (-0.56%)	⬇️

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