Resolve "Remove  export_fast_serialize feature flag"

See merge request gitlab-org/gitlab!28037

- Remove feature flag from specs
- Remove feature flag from LegacyTreeSaver

Speed up project templates API specs

See merge request gitlab-org/gitlab!28260

Default issue health status feature flag to on

See merge request gitlab-org/gitlab!28146

Update graphql statistics  holders to GraphQL::FLOAT_TYPE

See merge request gitlab-org/gitlab!23131

Add tracking events in API::ContainerRegistryEvent

Closes #20378

See merge request gitlab-org/gitlab!27001

Replace underscore with lodash in env folder

Closes #196673

See merge request gitlab-org/gitlab!27160

- replaced underscore functions with lodash equivalents
- moved chain to flow as the babel plugin for lodash
  does not support chain
- used composition instead https://medium.com/making-internets/why-using-chain-is-a-mistake-9bc1f80d51ba
- used partial right for sortBy
  https://stackoverflow.com/questions/56324387/jest-throwing-typererror-expected-a-function-when-using-lodash-pipe-flow
- escape, isFunction, isUndefined, isNull, omit, chain, isEqual,
  and isEmpty

Replaces underscore with lodash `ee/app/assets/javascripts/environments`

See merge request gitlab-org/gitlab!28292

Link references in CI docs

See merge request gitlab-org/gitlab!28277

Removes final cases of markdown reference links
from ci docs.

Resolve Migrate '.fa-spinner' to '.spinner' for 'ee/app/views/projects/settings'

See merge request gitlab-org/gitlab!25038

Fix duplicate query problem in `boards/issues`

See merge request gitlab-org/gitlab!27505

Prevent issues of being promoted twice

See merge request gitlab-org/gitlab!27837

De-duplicate GlRepository EE specs

See merge request gitlab-org/gitlab!27952

Make a sentence clearer in Markdown doc

Closes #211987

See merge request gitlab-org/gitlab!28217

Document limit on emails from auto-responders

See merge request gitlab-org/gitlab!28137

Remove rspec-set gem

Closes #27922

See merge request gitlab-org/gitlab!28282

We've removed all instances of `set` and have moved them all over to
use `let_it_be`

This does update the schema, but does not require large updates in the frontend, as opposed to Types::BigInt which would require string -> number casting. 
GraphQL-induced type casting should prevent type issues according to https://spec.graphql.org/June2018/#sec-Float

The values allowed in this type should suffice for the foreseeable future.

Also  updated the changelog to document this limitation.

This would currently fail due to graphql-constraints on integer types (which is of range -2^31 .. 2^31-1)

INT_TYPE can only hold 2**31 (?), which is not enough for large projects and root namespaces.

Replace set to let_it_be in ee/spec

See merge request gitlab-org/gitlab!27989

Get rids of `set` in specs

Add version text for new feature

See merge request gitlab-org/gitlab!28176

Disable archive rate limit by default

See merge request gitlab-org/gitlab!28264

Don't send 'accept-encoding' header in HttpIO

Closes #212609

See merge request gitlab-org/gitlab!28239

Net::HTTP does not automatically decompress requests sent with a
range header, as is done by HttpIO#request, causing the body of
any gzipped responses to be unreadable.

This change removes the 'accept-encoding' header from requests sent
by HttpIO, ensuring responses are not gzipped.

Development Documentation: fix minor typo

See merge request gitlab-org/gitlab!28272

Contractions section: that's' vs that's

Make all HTTPS cookies set SameSite to none

Closes #212551

See merge request gitlab-org/gitlab!28205

Update Repository Analytics feature title

See merge request gitlab-org/gitlab!28162