[TT-10414] [release-4-lts] Fix python coprocess tests, pin protobuf dependency in CI

[titpetric]

No description provided.

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.

[buger]

API tests result: success ✅
Branch used: refs/heads/release-4-lts
Commit: 4234213 Merging to release-4-lts: TT-8547 Fix websocket error proxying (#4918)

TT-8547 Fix websocket error proxying (#4918)

Description

Upgrade websocket only when server responded with 101.
Fixes the case when websocket have own authentification, so we can proxy
this error.

Motivation and Context

How This Has Been Tested

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing
  functionality to change)
• Refactoring or add test (improvements in base code or adds test
  coverage to functionality)

Checklist

• I ensured that the documentation is up to date
• I explained why this PR updates go.mod in detail with reasoning
  why it's required
• I would like a code coverage CI quality gate exception and have
  explained why
  Triggered by: push (@buger)
  Execution page

[buger]

API tests result: success ✅
Branch used: refs/pull/5737/merge
Commit:
Triggered by: pull_request (@titpetric)
Execution page

[buger]

API tests result: success ✅
Branch used: refs/pull/5737/merge
Commit: 3848ccd
Triggered by: pull_request (@titpetric)
Execution page