Adds API support for Project Deployment Frequency

See merge request gitlab-org/gitlab!48265

**app/models/deployment.rb:**
Select deployments that were created within a datetime range.

**ee/app/finders/analytics/deployments_finder.rb:**
Find successful deployments for a project within a datetime range.

**ee/changelogs/unreleased/api-support-for-deployment-frequency.yml:**
Changelog.

**ee/lib/api/analytics/project_deployment_frequency.rb:**
API for getting deployment frequencies for projects.

**ee/lib/ee/api/api.rb:**
Mount the new deployment frequency API.

**ee/lib/ee/api/entities/analytics/deployment_frequency.rb:**
Shape of deployment frequency API responses.

**ee/spec/requests/api/analytics/project_deployment_frequency_spec.rb:**
Test API.

**ee/spec/finders/analytics/deployments_finder_spec.rb:**
Test deployments finder.

**spec/models/deployment_spec.rb:**
Test created_between method.

**doc/user/project/index.md:**
Adds some docs for the new licensed feature flag.

**doc/api/project_analytics.md:**
Adds some docs for the API.

**ee/app/models/license.rb:**
Adds new licensed feature flag for project analytics.

**ee/app/policies/ee/project_policy.rb:**
Adds new policies for the new project analytics feature flag.

**ee/spec/policies/project_policy_spec.rb:**
Test for new project analytics policy and feature flag.

**db/structure.sql:**
**db/migrate/
20201211042306_add_deployments_finder_by_finished_at_index.rb:**
**db/schema_migrations/20201211042306:**

Adding new index to make the deployments finder query fast.

Fix performance issue finding snippet replicables

See merge request gitlab-org/gitlab!49518

Fix a performance issue when looking up snippet repositories
when replication is enabled by namespace

Relates to https://gitlab.com/gitlab-org/gitlab/issues/287763

Update Gitaly version

See merge request gitlab-org/gitlab!49879

Future tense style clean up for Protect

See merge request gitlab-org/gitlab!49874

Minor updates to protect content to remove future tense & possessives.

Add section to dependency proxy about rate limiting

See merge request gitlab-org/gitlab!49749

Add extra check for Opsgenie form

See merge request gitlab-org/gitlab!49863

Resolve "Update copy on User Lists empty state"

See merge request gitlab-org/gitlab!49642

Typo fix for release-cli doc

See merge request gitlab-org/gitlab!49866

Log invalid realtions build during Gitlab Project/Group import

See merge request gitlab-org/gitlab!49717

**app/assets/javascripts/feature_flags/components/
feature_flags.vue:**
**app/assets/javascripts/feature_flags/components/
feature_flags_tab.vue:**

Custom empty tile description.

**locale/gitlab.pot:**
**spec/frontend/feature_flags/components/feature_flags_tab_spec.js:**

Updated.

**changelogs/unreleased/update-copy-on-user-lists-empty-state.yml:**

Changelog.

Update gitlab-styles gem in overcommit

See merge request gitlab-org/gitlab!49853

Implement alert status change

See merge request gitlab-org/gitlab!49183

Merge branch '291075-use-userdiscussionscountresolver-and-usenotescountresolver-for-mergerequesttype' into 'master'

Use UserDiscussionsCount, UseNotesCount Resolvers for MergeRequestType

See merge request gitlab-org/gitlab!49515

Fix reset button showing on new integrations

See merge request gitlab-org/gitlab!49603

[RUN AS-IF-FOSS] Resolve "Jest: board_form_spec spec failing in foss pipeline"

See merge request gitlab-org/gitlab!49838

Add Auto Fix service

See merge request gitlab-org/gitlab!48679

This is a wrapper around VulnerabilityFeedback::CreateService
It's needed to create MR with remediations automatically.
Security Bot is an author of such MRs

Track index bloat estimate

See merge request gitlab-org/gitlab!49822

Add ldap encrypted credentials to the usage_data

See merge request gitlab-org/gitlab!48210

Fix rendering of history items in members filter bar

See merge request gitlab-org/gitlab!49650

Display token option title instead of the value

Capture subgroup creation failure during Group Import

See merge request gitlab-org/gitlab!49484

Reduce object allocations for large merge request

See merge request gitlab-org/gitlab!49563

Change return logic in pipelines_controller

See merge request gitlab-org/gitlab!49846

Remove deprecated fa- classes

See merge request gitlab-org/gitlab!49802

Improves documentation for instance_clusters.md

See merge request gitlab-org/gitlab!48428

Debian Packages

See merge request gitlab-org/gitlab!49217

Merge branch '277133-insert-finding_uuid-values-into-the-vulnerability_feedback-while-creating-the-records' into 'master'

Insert `finding_uuid` value into `vulnerability_feedback` when creating records

See merge request gitlab-org/gitlab!49408

Add issue header mobile dropdown loading state

See merge request gitlab-org/gitlab!49734