We want to upgrade the version of the Sentry gem we're currently using
to the latest version. However, this makes some breaking changes. One of
the biggest for our purposes is that it no longer supports processors -
these were classes to pre-process the event hash before sending to
Sentry.

In the latest version, these are no longer available, but we can still
use any logic we like in a custom `before_send` hook. So we can manually
chain our existing processors there. However, there's a catch:
processors in the current version take an event hash, but the
`before_send` hook takes an Event object. (Raven::Event in the current
version, Sentry::Event in the new one.)

This change adds a feature flag - sentry_processors_before_send - that
defaults to off. When it's off, we use the processors as we do now. When
it's on:

1. All the processors become no-ops when called as processors.
2. We enable them in a `before_send` chain through a different
   interface.

Because they take a different type of argument, this makes the
processors in this change a little ugly. We can tidy that up once we've
validated this feature flag in production, even before upgrading the
gem. We also add specs to test each processor both with and without the
feature flag enabled.

This lets us refactor the processors with some confidence that the end
result stays the same.

Feat: Update schedule grid to start at beginning of current week

See merge request gitlab-org/gitlab!57004

Update the schedule grid to allow
the grid to begin at the first day
of the current week but still track
the current day via the current
day indecator

Fix: Add description to oncall schedules view

See merge request gitlab-org/gitlab!56796

Conan package API docs

See merge request gitlab-org/gitlab!57428

Geo Node Status 2.0 - Progress Bar

See merge request gitlab-org/gitlab!56990

Add Maven API documentation

See merge request gitlab-org/gitlab!57509

Merge branch '292698-save-usage_data_id-raw_data_id-we-receive-from-versions-in-raw_usage_data' into 'master'

Save usage_data_id from versions app in raw_usage_data

See merge request gitlab-org/gitlab!54738

Handle GRPC::NotFound in Gitaly tree_entry call

See merge request gitlab-org/gitlab!57179

For https://gitlab.com/gitlab-org/gitaly/-/merge_requests/3078, which is
planned for GitLab 14.0.

Usage ping non sql metrics

See merge request gitlab-org/gitlab!56951

Hide "New issue" button from Auditors on empty project issues page

See merge request gitlab-org/gitlab!56877

Address technical debt in commit_block

See merge request gitlab-org/gitlab!57294

Alert integration UX cleanup - 3rd part

See merge request gitlab-org/gitlab!55892

Flaky test: Release DB proxy's host when clearing configuration

See merge request gitlab-org/gitlab!57320

::Gitlab::Database::LoadBalancing.clear_configuration is used for
testing purpose only. It should be converted to a test helper instead

Add feature spec for creating fork

See merge request gitlab-org/gitlab!55932

Duplicate "storage" tab to "other storage" [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!57121

It updates the import paths in the specs to reference the correct
new files

Move usage of delayed_project_removal to namespace settings

See merge request gitlab-org/gitlab!56397

Merge branch '293843-expand-filtering-functionality-of-vulnerabilities-graphql-endpoint-to-support-vendor' into 'master'

Vulnerabilities scope to filter by scanner ID

See merge request gitlab-org/gitlab!55909

Added new scope to Vulnerability model
Added new scope to Scanner model
Renamed scopes
Added/updated tests

Make `ci_runner_builds_queue_on_replicas` default

See merge request gitlab-org/gitlab!57484

Rename release Vuex store modules

See merge request gitlab-org/gitlab!56998

Updates the name of the Vuex store modules used on the releases pages.

"list" is now "index", "detail" is now "editNew".

Allow setting the shard/replica separately for ES indexes (step 1)

See merge request gitlab-org/gitlab!56344

Rename vulnerability report integration tests

See merge request gitlab-org/gitlab!57518

Show skipped duration for all skipped pipelines

See merge request gitlab-org/gitlab!57242

Add gitlab_schema.gql warning in integration spec

See merge request gitlab-org/gitlab!57375

Remove mention of `add_column_with_default` from guidance

See merge request gitlab-org/gitlab!57440

Only admins can view and edit max pages size

See merge request gitlab-org/gitlab!57450