The repository charts page used to detect the repository language for
each request that was made to the page. Given the detection is an
expensive operation and the same data is stored in the database the
database is now serving the request.

The same goes for an API endpoint that serves the languages.

When a repository is empty or non-existent the languages will always be
empty. And the language detection RPC isn't requested.

Closes: https://gitlab.com/gitlab-org/gitlab-ce/issues/47390

Enables frozen string for some vestigial files as
well as the following:

* app/controllers/projects/**/*.rb
* app/controllers/sherlock/**/*.rb
* app/controllers/snippets/**/*.rb
* app/controllers/users/**/*.rb

Partially addresses #47424.

Allow to access pipelines even if they are disabled, but only present jobs and commit statuses without giving ability to access them

This commit changes the colours of languages in the language graph to
the ones Linguist has defined.  When there is no colour defined for a
language in Linguist, it will fall back to the old method of finding
a colour.

- Parameter validation as ISO8601 format

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

It is now possible to view contributor and commit statistics for
refs beyond the default branch.

Additionally, conditions in RefsController#switch have been refactored
in order that a `case` block is used now.

Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

with existing method_missing. Pattern already used extensively,
so let's be consistent and use it everywhere.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

* remove commits stats page (will be replaced by graphs)
* remove additions/deletions from graph because of bad performance
* keep graph logic in gitlab

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Created tests and refactored some code along the way

Added stat graph util spec, refactored code

finsihed up tests and refactors

finsihed up tests and refactors