auth proxy: whitelist proxy ip instead of client ip

This change updates the `.dockerignore` file to no longer contain the `vendor/`
directory. When a Go project provides a `vendor/` directory within the
repository, the best practice is to build that project using their vendored
dependencies. By putting it in the `.dockerignore` file we prevent consumers
from easily doing that.

The `vendor/` directory is used to include all of the dependencies needed to
build a project. This makes it so that we can reproducibly build the project, at
any given commit, because the dependencies will always be present. Also, using
the vendor directory avoids us needing to continually re-download all the
dependencies, and it protects us from build failures if GitHub is down or a
dependency gets removed or renamed.

In addition to the change above, this also removes an extra `/tmp` entry from
the `.dockerignore` file.

Fixes #12304

Signed-off-by: Tim Heckman <t@heckman.io>

cloudwatch: handle invalid time range

Influxdb: add mode functions

use ng-if for the panel timeInfo

docs: adds info about grafana-dev container

[skip ci]

units: Litre/min and milliLitre/min in Flow

Internal Influx Flux plugin cleanup

docs: HTTP Endpoint for Deleting an Organization

docs: delete_datasources -> deleteDatasources in provisioning

fixes https://github.com/grafana/grafana/issues/12293

closes #12286

karma to jest: 6 test files

[skip ci]

alerting: fix mobile notifications for microsoft teams notifier

[skip ci]

units: W/m2(energy), l/h(flow) and kPa(pressure)

karma to jest: exporter, playlist_edit_ctrl

Expose react and slate to external plugins

dsproxy: allow multiple access tokens per datasource

fix panel link icon positioning

After refactoring to be able to mock the client in
a test, the client wasn't a global variable anymore.
This change moves the client back to being a package-
level variable.

Experimental support for react in external plugins

- react
- slate (editor)
- papaparse (csv parsing)
- prismjs (syntax highlighting)

This is needed for new external datasource plugins like Flux