Install notation as prerequisite for test Makefile target

[adodon2go]

What type of PR is this?
bug fix

Which issue does this PR fix:

What does this PR do / Why do we need it:
When running 'make test' the tests will fail if the user does not have notation tool installed.
We need a target that will check if notation is installed and if it is not- to install it before running the tests.

If an issue # is not available please add repro steps and logs from IPAMD/CNI showing the issue:
Failures:

• zotregistry.io/zot/pkg/api_test/controller_test.go
  Line 2971:
  Expected: nil
  Actual: 'exec: "notation": executable file not found in $PATH'

524 total assertions

--- FAIL: TestImageSignatures (4.50s)

Testing done on this change:
'make test' passes regardless if you have notation tool installed or not

Automation added to e2e:
Not needed

Will this break upgrades or downgrades. Has updating a running cluster been tested?:

Does this change require updates to the CNI daemonset config files to work?:

Does this PR introduce any user-facing change?:
No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #326 (1861597) into main (ac3801e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #326   +/-   ##
=======================================
  Coverage   80.28%   80.28%           
=======================================
  Files          46       46           
  Lines        6294     6294           
=======================================
  Hits         5053     5053           
  Misses        873      873           
  Partials      368      368           

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