[chore] Prepare release v0.78.1

[opentelemetrybot]

The following commands were run to prepare this release:

• make chlog-update VERSION=v0.78.1
• make prepare-release GH=none PREVIOUS_VERSION=0.78.0 RELEASE_CANDIDATE=0.78.1 MODSET=beta

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (bf6ca2b) 90.99% compared to head (75475c3) 90.97%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7709      +/-   ##
==========================================
- Coverage   90.99%   90.97%   -0.03%     
==========================================
  Files         295      295              
  Lines       14548    14548              
==========================================
- Hits        13238    13235       -3     
- Misses       1046     1048       +2     
- Partials      264      265       +1     

Impacted Files	Coverage Δ
cmd/builder/internal/builder/config.go	68.67% <ø> (ø)
cmd/otelcorecol/main.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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