And update some eslint issues

When user is not logged in, we should show a sign in
button instead.
- Pass the path (and logged in state) from backend.
- Frontend still needs to get the return_to location from
the Jira AP context.

- When feature flag `new_jira_connect_ui` is enabled,
we need to apply the correct GitLab UI classes.
- Fix missing spacing inside button when using the
`external_link` helper.
- Remove Chrome from recommended browsers.
- Update "Learn more" link with newer issue that tracks
work done to fix cross-site cookies bug.
- Update margins and spacing

According to UX recommendations
- Update user link from profile page to jira_connect/users
path as it's more useful to show
- Add translations to some static strings

Updated version history note format

See merge request gitlab-org/gitlab!52533

Add "free upgrade" marketing UX

See merge request gitlab-org/gitlab!51702

Add service to get plan upgrade info
Add specs for new helper methods

Move simple, useful methods from helper to model

See merge request gitlab-org/gitlab!51414

Refactor variables merging for job rules

See merge request gitlab-org/gitlab!52305

This will be a first step before implementing workflow:rules:variables

Move PipelineEntity to the Ci namespace

See merge request gitlab-org/gitlab!52248

Bold metricDetailsLabel in the performance bar

See merge request gitlab-org/gitlab!52417

Edit UI text for repository cleanup

See merge request gitlab-org/gitlab!52384

Fix diff sorting when 2 files have the same name

See merge request gitlab-org/gitlab!52202

Fix missing setting LDAP servers

See merge request gitlab-org/gitlab!52512

Remove obsolete DOMContentLoadedEventListener

See merge request gitlab-org/gitlab!52313

PipelineEntity.rb -> Ci::PipelineEntity.rb

FE development guideline improvements based on Vale warnings

See merge request gitlab-org/gitlab!52394

Addressing various Vale errors & warnings in fe_guide documentation

Documentation for marking files as viewed

See merge request gitlab-org/gitlab!48976

Fix viewing blobs for broken MRs

See merge request gitlab-org/gitlab!52483

Ensure diff patch size limit is monitorable

See merge request gitlab-org/gitlab!52456

Update EE MR widget tests to match guidelines

See merge request gitlab-org/gitlab!52478

Add link to our experiences with --no-tags

See merge request gitlab-org/gitlab!52225

Fix more keyword warnings

See merge request gitlab-org/gitlab!52302

Add new text to the coverage guided fuzz testing documentation

See merge request gitlab-org/gitlab!52342

Enable optimized_issuable_label_filter FF

See merge request gitlab-org/gitlab!52495

Document how alert description is extracted from Prometheus payloads

See merge request gitlab-org/gitlab!52506

New partial for SSH Key Deletion

See merge request gitlab-org/gitlab!50825

Replace angle-double-left icon with chevron-double

See merge request gitlab-org/gitlab!52393

UI - Remove badges from DAST site validations

See merge request gitlab-org/gitlab!52301

Use icons instead of badges for showing
site validation statuses in DAST profile
library page