Add changelog for MR 529

See merge request gitlab-org/gitlab-workhorse!545

Added configuration option PropagateCorrelationID

See merge request gitlab-org/gitlab-workhorse!529

added configuration option PropagateCorrelationID and corresponding flag argument propagateCorrelationID to enable correlation.InboundHandlerOption: WithPropagation() for correlation.InjectCorrelationID

Improve test report for performance_test.go

See merge request gitlab-org/gitlab-workhorse!535

Drop Go v1.12 support

See merge request gitlab-org/gitlab-workhorse!532

We officially use Go v1.13+ for everything
(https://docs.gitlab.com/ee/install/requirements.html#go-versions), and
dropping Go v1.12 allows us to use new methods such as
`http.NewRequestWithContext`.

Document changelog as part of process

See merge request gitlab-org/gitlab-workhorse!530

Generating a changelog entry is now required when a merge request
warrants a CHANGELOG entry.

[ci skip]

Read and parse LSIF references

See merge request gitlab-org/gitlab-workhorse!524

In order to be able to "Find references" of a given range or
definition, we need to be able to read `references` items from
the LSIF file.

This will then be written to the JSON file for each range via
`references` property.

The property will look something like:

```
"references": [
  {
    "path": "main.go#L7"
  }
]
```

Each reference will be an object with `path` property. The `path`
property will point to the exact line where it is being used.

This is currently behind a feature flag (`code_navigation_references`)
which will set `ProcessLsifReferences` header to `true` when
enabled. If `false`, the `references` won't be read and generated.

Refactor to prepare for parsing references

See merge request gitlab-org/gitlab-workhorse!523

Eagerly delete private tempfiles

See merge request gitlab-org/gitlab-workhorse!526

Preparation for supporting other type of item (e.g. references).

This MR includes the following changes:
- Rename `RawDefRef` to `RawItem`.
- Rename `DefRef` to `Item`.

Remove deprecated option

See merge request gitlab-org/gitlab-workhorse!513

Add missing bounds checks in LSIF parser

See merge request gitlab-org/gitlab-workhorse!527

Make upload filter code (EXIF, LSIF) more uniform

See merge request gitlab-org/gitlab-workhorse!525

Log errors if lsif parser failed to close

See merge request gitlab-org/gitlab-workhorse!521

[ci skip]

Use latest Golang in order to build code navigation

See merge request gitlab-org/gitlab-workhorse!522

Cache hovers offsets in a file instead of a hash

See merge request gitlab-org/gitlab-workhorse!501

Storing them in a hash consumes a lot of RAM
Introducing a file helps to reduce RAM consumption significantly

Cache ranges value in a file instead of a hash

See merge request gitlab-org/gitlab-workhorse!500

Storing them in a hash consumes a lot of RAM
Introducing a file helps to reduce RAM consumption significantly

Use simplified setup for code intelligence

See merge request gitlab-org/gitlab-workhorse!520

Truncate hover values to 250 utf-8 characters

See merge request gitlab-org/gitlab-workhorse!511

Super long documentation is not very usable, but consumes a lot
of memory

[ci skip]

Send hover tokens instead of raw html

See merge request gitlab-org/gitlab-workhorse!517