Refactor error tracking gzip decompression

What does this MR do and why?

Error tracking has 2 endpoints: one of it uses middleware to decompress payload, another uses regular class. This MR makes both endpoints use the same middleware instead.

1. Add application/x-sentry-envelope support to lib/gitlab/middleware/compressed_json.rb middleware
2. Remove gzip decompression from lib/error_tracking/collector/sentry_request_parser.rb since we do it with middleware now.

We do this to remove code repetition.

No changes from user perspective.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

assigned to @dzaporozhets

changed title from Add gzip support to error tracking collector to Refactor error tracking gzip decompression

changed the description

marked this merge request as draft

added backend label

Reviewer roulette

Changes that require review have been detected!

Please refer to the table below for assigning reviewers and maintainers suggested by Danger in the specified category:

Category	Reviewer	Maintainer
backend	Drew Blessing (@dblessing) (UTC-5, 7 hours behind @dzaporozhets)	Tetiana Chupryna (@brytannia) (UTC+3, 1 hour ahead of @dzaporozhets)

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Allure report

allure-report-publisher generated test report for a67536c1!

review-qa-smoke: test report

added 2587 commits

• a67536c1...993ebdf8 - 2586 commits from branch master
• 6c1b4d38 - Refactor error tracking gzip decompress

Compare with previous version

changed milestone to %14.5

changed the description

added Category:Error Tracking devopsmonitor grouprespond labels

added 1 deleted label

added typefeature label

marked the checklist item I have evaluated the MR acceptance checklist for this MR. as completed

marked this merge request as ready

@dblessing please review backend

requested review from @dblessing

added typemaintenance label and removed typefeature + 1 deleted label

approved this merge request

requested review from @a_akgun

@dblessing, thanks for approving this merge request.

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added sectionops label

removed review request for @dblessing

approved this merge request

resolved all threads

enabled an automatic merge when the pipeline for 30b0939f succeeds

merged

mentioned in commit 54fdbba9

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