Optimize cert loading/rewewal checks on server startup

[natemcmaster]

Fixes

• check if certificate needs renewal immediately on startup instead waiting 24 hours
• Optimize loading intermediate certificate change and reduce unnecessary warnings about invalid certs

[codecov[bot]]

Codecov Report

Merging #205 (6330ef7) into main (e5f5089) will increase coverage by 0.23%. The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
+ Coverage   45.70%   45.94%   +0.23%     
==========================================
  Files          44       44              
  Lines        1107     1110       +3     
==========================================
+ Hits          506      510       +4     
+ Misses        601      600       -1     

Impacted Files	Coverage Δ
...ncrypt/Internal/AcmeStates/CheckForRenewalState.cs	0.00% <0.00%> (ø)
src/LettuceEncrypt/Internal/CertificateSelector.cs	55.38% <100.00%> (+1.41%)	:arrow_up:
...ettuceEncrypt/Internal/StartupCertificateLoader.cs	92.85% <100.00%> (+1.19%)	:arrow_up:

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