Move from httpretty to mocket as http mocking library

[xrmx]

Description

Move urllib, urllib3 and requests instrumentation http mock library from abandoned httpretty to mocket. I've tried to use their httpretty shim layer first but it's incomplete and adding the missing part would need to implement a different API that the httpretty original one. This let us run urllib3 tests on Python 3.14.

Fixes #4200
Closes #4318
Closes #4282

Assisted-by: Cursor

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A

Does This PR Require a Core Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[emdneto]

It seems it just works? and doesn't require any fix on the lib side like pook, so I'm good.

[xrmx]

It seems it just works? and doesn't require any fix on the lib side like pook, so I'm good.

Yeah, using the shim would have been a 20 lines diff but switching to use plain mocket was not that bad.