manifestutils: configure CA and ServicePKI by name

[frzifus]

Roughly what you had in mind?
cc @andreasgerstmayr @IshwarKanse

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 9.52381% with 19 lines in your changes missing coverage. Please review.

Project coverage is 72.88%. Comparing base (0c5313e) to head (7ac151f).

Files with missing lines	Patch %	Lines
internal/manifests/manifestutils/service.go	0.00%	18 Missing ⚠️
internal/manifests/queryfrontend/query_frontend.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1039      +/-   ##
==========================================
- Coverage   73.10%   72.88%   -0.23%     
==========================================
  Files         106      106              
  Lines        6630     6642      +12     
==========================================
- Hits         4847     4841       -6     
- Misses       1493     1511      +18     
  Partials      290      290              

Flag	Coverage Δ
unittests	72.88% <9.52%> (-0.23%)	⬇️

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[andreasgerstmayr]

Roughly what you had in mind? cc @andreasgerstmayr @IshwarKanse

yes 👍

Probably we should merge it with https://github.com/grafana/tempo-operator/blob/fce6a2af70615d79c01ac17a94b52fa0bc0d317e/internal/manifests/manifestutils/tls.go at some point, which afaics serves (almost?) the same purpose - mounting TLS certs/keys in the container.