Disable project avatar validation if avatar has not changed

Closes #51053

See merge request gitlab-org/gitlab-ce!21506

Every time a column in the projects table is changed, the Avatarable concern
would validate that the avatar file size was under 200K.  This not only delays
the database changes, but it also can lead to unrelated failures if the HTTP
request fails for some reason.

Closes #51053

Update rubyzip gem to 1.2.2 (CVE-2018-1000544)

Closes #50930

See merge request gitlab-org/gitlab-ce!21460

Feature/new merge breadcrumbs

See merge request gitlab-org/gitlab-ce!21502

Add gitaly_calls to API structured logs

See merge request gitlab-org/gitlab-ce!21496

Merge branch 'docs-50155-user-added-as-a-reporter-can-not-edit-labels-on-merge-requests' into 'master'

Clarify roles with permission to label Merge Requests

Closes #50155

See merge request gitlab-org/gitlab-ce!21166

Add search to group labels page

See merge request gitlab-org/gitlab-ce!21480

fixes breadcrumbs on new issue page. adds link to issues page.

Closes #50209

See merge request gitlab-org/gitlab-ce!21305

Conditional partial rendering for EE in application settings

See merge request gitlab-org/gitlab-ce!21482

Rails 5: include opclasses in rails 5 schema dump

See merge request gitlab-org/gitlab-ce!21416

Migrate job artifacts data from `ci_builds` to `ci_job_artifacts` table (with Background migrations)

Closes #46652

See merge request gitlab-org/gitlab-ce!18615

[QA] Add a new Test::Sanity::Failing scenario that always fails

Closes gitlab-qa#28

See merge request gitlab-org/gitlab-ce!21477

Merge branch '50991-qa-page-shared-clonepanel-should-be-moved-to-page-component-clonepanel-qa' into 'master'

Resolve "[QA] Page::Shared::ClonePanel should be moved to Page::Component::ClonePanel"

Closes #50991

See merge request gitlab-org/gitlab-ce!21479

Restrict reopening locked issues for non authorized issue authors

Closes #39665

See merge request gitlab-org/gitlab-ce!21299

doc/job_traces.md: the file is job.log

See merge request gitlab-org/gitlab-ce!21360

Enable JUnit results for rspec

See merge request gitlab-org/gitlab-ce!21449

Send required object storage PUT headers in /uploads/authorize API

See merge request gitlab-org/gitlab-ce!21319

Fix bugs/edge cases of JUnitParser

Closes #50960

See merge request gitlab-org/gitlab-ce!21469

Rails 5: support schema t.index for mysql

See merge request gitlab-org/gitlab-ce!21485

Fix wording in Danger warning about MRs to non-master

See merge request gitlab-org/gitlab-ce!21493

Unused CSS part exists in mobile CSS framework

Closes #50879

See merge request gitlab-org/gitlab-ce!21439

Set issuable_sort and diff_view cookies to secure when possible

Closes #49120

See merge request gitlab-org/gitlab-ce!21442

Uploads to wiki stored inside the wiki git repository

Closes #33475

See merge request gitlab-org/gitlab-ce!21362

Fix QA ObjectStorage not inheriting from Test::Instance::All

See merge request gitlab-org/gitlab-ce!21494

If it's most of the time, then it's not all.

Disable Web IDE button if user is not allowed to push the source branch.

Closes #45026

See merge request gitlab-org/gitlab-ce!21288

Add artifact information in job API

See merge request gitlab-org/gitlab-ce!21328

Closes #49120

Make cache vs artifacts section more visible, and minor enhancements to text.

See merge request gitlab-org/gitlab-ce!21491

Resolve "Should we still use Flay?"

Closes #44750

See merge request gitlab-org/gitlab-ce!21476