added a check for the absence of a tag at all in dockerfile-deny-latest-image-policy

[ya-makariy]

Explanation

The policy lacked a rule to check for the absence of a tag at all
As written in the docker documentation:

The tag or digest values are optional. If you omit either of them, the builder assumes a latest tag by default. The builder returns an error if it can't find the tag value.

Related issue

Milestone of this PR

What type of PR is this

Proposed Changes

Proof Manifests

Checklist

• I have read the contributing guidelines.
• I have read the PR documentation guide and followed the process including adding proof manifests to this PR.
• This is a bug fix and I have added unit tests that prove my fix is effective.
• This is a feature and I have added CLI tests that are applicable.
• My PR needs to be cherry picked to a specific release branch which is .

Further Comments

[ya-makariy]

Hi, @eddycharly. Any updates on this PR?