fix(dav): adjust usages of webdav.customRequest

[st3iny]

• Resolves: [Bug]: Webdav availability request gives malformed response #44205

Summary

Webdav is not using axios any more so we have to await a response's body ourselves.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[st3iny]

/backport to stable28

[ChristophWurst]

Is it broken in 28? 🤔

[st3iny]

It's not so we can skip the backport for now.

Although it was fixed for >= 27 in other places last year: a66cae0

[valentin-ed]

There is still the issue on 28.0.9, as I can see in https://github.com/nextcloud/server/blob/v28.0.9/apps/dav/src/service/CalendarService.js the line 61 wasn't change with this PR. When do you think this would be done ?

[st3iny]

/backport to stable28

[backportbot]

The backport to stable28 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable28
git pull origin stable28

# Create the new backport branch
git checkout -b backport/44344/stable28

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick e727a3b0

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/44344/stable28

Error: Failed to clone repository: Failed to checkout branches: Updating 1cc7851..ab511e8
From https://github.com/nextcloud/server

• [deleted] (none) -> origin/adapterQueryOpti
• [deleted] (none) -> origin/automated/noid/stable29-fix-npm-audit
• [deleted] (none) -> origin/backport/47325/stable26
• [deleted] (none) -> origin/backport/47598/stable29
• [deleted] (none) -> origin/backport/stable30/47158
• [deleted] (none) -> origin/chore/theming
• [deleted] (none) -> origin/exceptionsTranslateShare
• [deleted] (none) -> origin/executeStatementOnDelete
• [deleted] (none) -> origin/fix/appstore-upgrade-failure
• [deleted] (none) -> origin/fix/bring-back-security-fixes
  error: Your local changes to the following files would be overwritten by merge:
  dist/4254-4254.js.map.license
  dist/4696-4696.js.map.license
  dist/5643-5643.js.map.license
  Please commit your changes or stash them before you merge.
  Aborting

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.