Backport fixes for pipelines_store frontend specs

Closes #27871

See merge request !9067

Fix link in CONTRIBUTING.md

See merge request !8859

Remove plus icon from compare view

Closes #20495

See merge request !9056

API: remove `public` param for projects

Closes #23104

See merge request !8736

Limit level of nesting for groups

See merge request !9000

Update GitLab pages to v0.3.0

See merge request !9043

Filter todos by manual add

Closes #26705

See merge request !8861

Show how to reference a line within a repository file.

See merge request !8249

Fix the curl command for deleting files (DELETE instead of PUT)

See merge request !8245

Expose paginated environments list API endpoint

See merge request !8928

pass in current_user in MergeRequest and MergeRequestsHelper

See merge request !8624

Removed unused parameter status only

Closes #25607

See merge request !9035

lfs: do not require auth for public repositories

Closes #23360

See merge request !8824

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Syntax linting for init scripts

Closes #27787

See merge request !9054

Replace arrow function with regular function to prevent overiding function context

See merge request !9057

Add default labels to bulk assign dropdowns

Closes #27822

See merge request !9042

dismiss sidebar on action button click

Closes #27227

See merge request !8798

Show organisation membership and delete comment action on smaller viewports, plus chang…

Closes #25134

See merge request !8905

ensure karma fails if it cannot load all spec files

See merge request !9038

make the selector more inclusive

spec for dashboard’s sidebar visibility

fix linting errors for project dashboard page

remove unused var: shouldBeCollapsed

use project with repo, so download button became available

use es6 style for testing project dashboard

un-aliased global reference at sidebar.js.es6

fix spec from linting errors

code improvement

add singleton to `this`

assign `singleton` to class

add space in between

remove `no-underscore-dangle`

add complete changelog

sidebar internal state test

remove on page change, not exist in master. rebase.

only nicescroll if the element is there

new require style

reference to sidebar content outside of timeout

Revert "Merge branch 'fix-karma-coverage' into 'master'"

See merge request !9051

Add info about the new location of Integrations

Closes #27723

See merge request !9050

This reverts merge request !9044

[ci skip]

Support a string source in the route map

See merge request !9046

Fix rendering pipelines for a new merge request

See merge request !9032

Improve gl.utils.handleLocationHash tests

See merge request !9040