[WEB-2776] fix: restrict notifications

Walkthrough

The changes introduce a new import, ProjectMember, and modify the extract_mentions_as_subscribers and notifications functions in notification_task.py. The updates ensure that only active project members are processed for notifications and subscriptions based on user mentions. This includes checks to exclude users who are already subscribers, assignees, or creators of issues, enhancing the logic for managing user mentions and notifications. Additionally, the filtering functions in issue_filters.py are updated to consider only non-deleted labels and assignees.

Changes

File Path	Change Summary
`apiserver/plane/bgtasks/notification_task.py`	Added import of `ProjectMember` and updated logic in `extract_mentions_as_subscribers` and `notifications` to filter mentions and subscribers based on active project members.
`apiserver/plane/utils/issue_filters.py`	Modified `filter_labels`, `filter_assignees`, `filter_cycle`, and `filter_module` functions to include checks for the `deleted_at` field being null.

Possibly related PRs

#5260: This PR updates the ProjectMemberAPIEndpoint, which is directly related to the changes in the main PR that involve checking for active project members when determining subscribers.
#5601: This PR also focuses on project members, specifically addressing role validation, which aligns with the main PR's emphasis on active project members in the notification logic.
#5630: This PR modifies the project selection logic based on user permissions, which is relevant to the main PR's changes regarding active project members and their notifications.
#5981: This PR restricts sub-issues to the same project as their parent, which relates to the overall management of project members and their roles in notifications and subscriptions.

Suggested labels

🐛bug

Suggested reviewers

pablohashescobar
sriramveeraghanta
rahulramesha

🐰 In the meadow where rabbits play,
A change was made, hip-hip-hooray!
Active members now take the lead,
In notifications, they'll surely succeed!
With mentions clear and roles defined,
Our project thrives, all aligned! 🌼

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makeplane / plane