net/mlx5: HWS, fix redundant extension of action templates

net/mlx5: HWS, fix redundant extension of action templates

When a rule is inserted into a matcher, we search for the suitable
action template. If such template is not found, action template array
is extended with the new template. However, when several threads are
performing this in parallel, there is a race - we can end up with
extending the action templates array with the same template.

This patch is doing the following:
 - refactor the code to find action template index in rule create and
   update, have the common code in an auxiliary function
 - after locking all the queues, check again if the action template
   array still needs to be extended

Signed-off-by: Vlad Dogaru <vdogaru@nvidia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1746992290-568936-9-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>