fix(gh-actions): SRE-579 - fix static-pages workflows concurrency

[CarpathianUA]

For PR events:

• in-progress workflows will be canceled when a new workflow is triggered for the same concurrency group.
  When a new commit is pushed to a PR, it will cancel any running workflows associated with that PR.

For pushes (e.g. to the main branch):

• in-progress workflows will NOT be canceled when a new workflow is triggered by another push to the same branch (like main) - this means that for deployments or production builds, there won’t be any risk of canceling of ongoing deployment due to another push event.

For manually triggered workflows (workflow_dispatch):

• in-progress workflows will NOT be canceled when a new manual workflow is triggered, meaning manual deployments or other manual actions will not be interrupted by another action triggered via workflow_dispatch.