Expand components version specification format to allow branches

Closes gitaly#183

See merge request !10610

Currently we specify versions for Gitlab-Shell, Workhorse and Gitaly
using version strings, to which we prepend 'v' and assume are tags.
These changes allow branches or tags with other name formats to be
specified by prepending '=' to the version string (á la govendor).

We also simplify the process to reset to the given version (now a
branch or tag): Right now there's a check to supposedly try to avoid
fetching from the remote the version if it already exist locally. But
the previous logic already clones if the directory doesn't exist or
fetches if it does, so this check is pointless. We can safely assume the
version exists once we get to the reset stage.

Make the `gitlab:gitlab_shell:check` task check that the repositories storage
path are owned by the `root` group

Signed-off-by: Rémy Coutable <remy@rymai.me>

Add rake task that prints TOML storage configuration

Closes gitaly#173

See merge request !10448

Closes gitaly#173

Reset container width when switching to pipelines MR tab

Closes #29539

See merge request !10169

of unlimited width if they cannot detect terminal size, therefore
force unlimited terminal size when checking processes via ps.