Enforce the use of a supported Packer version

[AverageMarcus]

Is your feature request related to a problem? Please describe.

We're unable to support Packer v1.10.0+ due to #1246. At time of writing, the latest version of Packer that we support is v1.9.5 and is what is installed if Packer isn't found on the machine.

But if Packer v1.10+ is found on the machine image-builder will just happily attempt to use that version which can then lead to issues such as #1378

Describe the solution you'd like
We should restrict the version used and if v1.10+ is found we should still download v1.9.5. We'll need to update the Makefile also to make sure if uses the locally downloaded binary instead of the system-wide version of Packer.

Describe alternatives you've considered
Alternatively we could not download the version and instead show an error to the user but this means the user then needs to figure out how to downgrade their version.

Additional context
Add any other context or screenshots about the feature request here.

/kind feature

[kranurag7]

/assign

I'll attempt hacking on this during the weekend.

[sriramandev]

@kranurag7 Are you still working on this or should can I pick this up from where you left?

[kranurag7]

@kranurag7 Are you still working on this or should can I pick this up from where you left?

I was not able to give time to fix the failing tests on the PR. @sriramandev You can work on this.

You can take my PR as a base or create a new one. (ping me once if you've the PR ready, I'll close my PR)

/unassign

[kranurag7]

@sriramandev I added one commit (e66f4bf) which should be fixing the failing tests on the PR.
If you already started working on this, let me know I'll close mine as said above. If not, a review would be great.