refactor: remove redundant pylint disable from celery instrumentation

[forafox]

Description

This PR removes the redundant pylint: disable=attribute-defined-outside-init comment from the celery instrumentation and adds this rule to the global pylint disable list in .pylintrc.

The attribute-defined-outside-init pylint rule is problematic for OpenTelemetry instrumentations because attributes are commonly set during instrumentation (in methods like _instrument()) rather than in __init__. This pattern is used throughout the codebase (30+ occurrences) and is a standard practice for OpenTelemetry instrumentations where attributes are initialized during the instrumentation process.

By disabling this rule globally, we eliminate the need for individual pylint: disable comments across the codebase, making the code cleaner and more maintainable.

Fixes #3828

Type of change

• 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?

• Verified that the celery instrumentation file compiles without syntax errors
• Confirmed that the pylint disable comment has been completely removed from celery instrumentation
• Verified that attribute-defined-outside-init has been added to the global pylint disable list
• Ran pylint checks to ensure no new warnings are introduced

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: forafox / name: Andrey Karabanov (33578d7, 985b02f, d09241a, e00110a)

[xrmx]

If we are going to move this globally I would expect the other 30 occurences of the pylint disable to move removed too. Said that the lint warning may be useful in other cases.

[forafox]

If we are going to move this globally I would expect the other 30 occurences of the pylint disable to move removed too. Said that the lint warning may be useful in other cases.

Pull request updated
@xrmx