[stable26] feat: add utils for generating absolute links and copy a chat link

[backportbot-nextcloud]

backport of #9051

[nickvergessen]

Regression: the entries in the left sidebar are not linking to the rooms anymore, so you can no longer right-click => open in a new tab.

[ShGKme]

Regression: the entries in the left sidebar are not linking to the rooms anymore, so you can no longer right-click => open in a new tab.

I cannot reproduce

[Antreesy]

Also can't reproduce the bug. Works fine on Firefox and Chrome

[nickvergessen]

It's actually a regression from the Vue lib update i was testing before and I forgot to npm ci, sorry for the noise....

$ git bisect bad
a1e77c3bd934b9c5b2bbd44fda9bbba808663e41 is the first bad commit
commit a1e77c3bd934b9c5b2bbd44fda9bbba808663e41
Author: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Date:   Thu Mar 23 16:43:04 2023 +0000

    Build(deps): Bump @nextcloud/vue from 7.8.0 to 7.8.2
    
    Bumps [@nextcloud/vue](https://github.com/nextcloud/nextcloud-vue) from 7.8.0 to 7.8.2.
    - [Release notes](https://github.com/nextcloud/nextcloud-vue/releases)
    - [Changelog](https://github.com/nextcloud/nextcloud-vue/blob/master/CHANGELOG.md)
    - [Commits](https://github.com/nextcloud/nextcloud-vue/compare/v7.8.0...v7.8.2)
    
    ---
    updated-dependencies:
    - dependency-name: "@nextcloud/vue"
      dependency-type: direct:production
      update-type: version-update:semver-patch
    ...
    
    Signed-off-by: dependabot[bot] <[email protected]>

 package-lock.json | 217 ++++++++++++++++++++++++++++++++++++++++++++++++------
 package.json      |   2 +-
 2 files changed, 196 insertions(+), 23 deletions(-)

[nickvergessen]

Moved to #9153