closes 62127

Documentation for dynamic element validation

See merge request gitlab-org/gitlab-ce!29169

Signed-off-by: William Desportes <williamdes@wdes.fr>

This copy button manages a local instance of the Clipboard plugin
specific to it, which means it is created/destroyed on the
creation/destruction of the component. This allows it to work well in
gitlab-ui modals, as the event listeners are bound on creation of the
button.

It also allows for bindings to the `container` option of the Clipboard
plugin, which allows it to work within the focus trap set by bootstrap's
modals.

Update docs on how to request approval for licenses/IP

See merge request gitlab-org/gitlab-ce!28535

First iteration on the documentation for how
dynamic element validation works within the
GitLab QA framework and how to utilize it

Previously it was unclear if the docs changes should be included in
the MR as well, and adding a changelog entry in the CE MR also triggers
the ee-specific-lines-check job in CI.