This undeprecates the `allow-workspace-renames` flag. IIUC, the 'danger'
with using this flag is that the workspace name might have been used in
the definition of some other terraform resources within template code,
so a rename could cause problems such as with persistent disks.
for https://github.com/coder/coder/issues/21628
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Signed-off-by: Callum Styan <callumstyan@gmail.com>