Memory optimizations for various parts of the code

[grcevski]

Rebuilds what we had in #1028, without the parts that might be problematic.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.81818% with 8 lines in your changes missing coverage. Please review.

Project coverage is 73.64%. Comparing base (d433fd4) to head (6543f2c).

Files	Patch %	Lines
pkg/internal/infraolly/process/snapshot.go	0.00%	5 Missing and 1 partial ⚠️
pkg/export/alloy/traces.go	0.00%	0 Missing and 1 partial ⚠️
pkg/export/otel/metrics.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1096      +/-   ##
==========================================
+ Coverage   70.64%   73.64%   +3.00%     
==========================================
  Files         172      172              
  Lines       13073    13091      +18     
==========================================
+ Hits         9235     9641     +406     
+ Misses       3273     2906     -367     
+ Partials      565      544      -21     

Flag	Coverage Δ
integration-test	51.03% <45.45%> (?)
k8s-integration-test	52.97% <43.18%> (+0.12%)	⬆️
oats-test	33.78% <34.09%> (+0.28%)	⬆️
unittests	45.66% <79.54%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[rafaelroquetto]

LGTM