[master] allow users to handle properly baseUrl in portal next for multi tenant installations

[mergify]

This is an automatic copy of pull request #10444 done by Mergify.

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Issue

https://gravitee.atlassian.net/browse/APIM-7714

Description

allow users to handle properly baseUrl in portal next for multi tenant installations

Additional context

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Cherry-pick of 542f89a has failed:

On branch mergify/bp/master/pr-10444
Your branch is up to date with 'origin/master'.

You are currently cherry-picking commit 542f89a359.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   helm/templates/portal/portal-configmap.yaml
	modified:   helm/templates/portal/portal-deployment.yaml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   helm/Chart.yaml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

Cherry-pick of 542f89a has failed:

On branch mergify/bp/master/pr-10444
Your branch is up to date with 'origin/master'.

You are currently cherry-picking commit 542f89a359.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   helm/templates/portal/portal-configmap.yaml
	modified:   helm/templates/portal/portal-deployment.yaml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   helm/Chart.yaml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally