NETOBSERV-962 - ADD write ipfix stage to pipeline builder

[acmenezes]

@jotak @jpinsonneau , as we spoke:

This PR adds the write ipfix stage under the FLP pipeline builder in order to be used by the operator. The methods are reachable by the operator code this way. I tested by replacing the source while I made the changes.

Changes:

• Add WriteIpfix to pipeline_builder.go
• Add NewWriteIpfixParams to stage_params

[acmenezes]

@jpinsonneau if I'm not mistaken this PR still needs a NewIpfixPipeline and then the test based on that. I'm not sure how I should proceed for ipfix specifically. If you have any input let me know but I'll check on that as well.

[jpinsonneau]

@jpinsonneau if I'm not mistaken this PR still needs a NewIpfixPipeline and then the test based on that. I'm not sure how I should proceed for ipfix specifically. If you have any input let me know but I'll check on that as well.

As far as I see the NewXPipeline functions in /flowlogs-pipeline/pkg/config/pipeline_builder.go are preparing ingest stages. No changes needed there.
To test IPFIX export using the api, we can directly copy TestLokiPipeline function in /flowlogs-pipeline/pkg/config/pipeline_builder_test.go keeping the ingest + enrich stages and changing WriteLoki to WriteIpfix with proper parameters

[acmenezes]

@jpinsonneau I guess I got it. Let me know if it's enough. I can adjust if needed. I'll pass to test in cluster if it goes well I'll convert the PR from draft to normal.

[jpinsonneau]

Looks good ! Thanks @acmenezes 🥇

[jpinsonneau]

/approve to unlock netobserv/network-observability-operator#311

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[codecov]

Codecov Report

Merging #414 (e60a292) into main (a31a0c0) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #414      +/-   ##
==========================================
+ Coverage   64.39%   64.41%   +0.02%     
==========================================
  Files          94       94              
  Lines        6560     6564       +4     
==========================================
+ Hits         4224     4228       +4     
  Misses       2096     2096              
  Partials      240      240              

Flag	Coverage Δ
unittests	64.41% <100.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
pkg/config/pipeline_builder.go	84.74% <100.00%> (+0.53%)	⬆️
pkg/config/stage_params.go	92.85% <100.00%> (+0.54%)	⬆️

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