[proxmox_kvm] Don't create VM if name is used without vmid

[UnderGreen]

SUMMARY

Fixes #6911

While creating VM by using name only we check if VM with that name already exist and cluster and do nothing in that case.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

proxmox_kvm

ADDITIONAL INFORMATION

[ansibullbot]

cc @Ajpantuso @Thulium-Drake @helldorado @joshainglis @karmab
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[felixfontein]

Looks good to me. I'll merge in a couple of days if nobody objects.

[patchback]

Backport to stable-6: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply f944857 on top of patchback/backports/stable-6/f9448574bd43611d71932f0d88bc67585d528f2f/pr-6981

Backporting merged PR #6981 into main

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/ansible-collections/community.general.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/stable-6/f9448574bd43611d71932f0d88bc67585d528f2f/pr-6981 upstream/stable-6

4. Now, cherry-pick PR [proxmox_kvm] Don't create VM if name is used without vmid #6981 contents into that branch:

   $ git cherry-pick -x f9448574bd43611d71932f0d88bc67585d528f2f

   If it'll yell at you with something like fatal: Commit f9448574bd43611d71932f0d88bc67585d528f2f is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x f9448574bd43611d71932f0d88bc67585d528f2f

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR [proxmox_kvm] Don't create VM if name is used without vmid #6981 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/stable-6/f9448574bd43611d71932f0d88bc67585d528f2f/pr-6981

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to stable-7: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-7/f9448574bd43611d71932f0d88bc67585d528f2f/pr-6981

Backported as #6992

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[felixfontein]

@UnderGreen thanks a lot!