[BUG] PURL_functions acceptance test asserts over log files with zoned timestamp

[zregvart]

Describe the Bug

The snapshot differs based on the time zone of the computer the acceptance tests are running on.

Steps to Reproduce

1. cd acceptance
2. go test -test.run 'TestFeatures/PURL_functions

Expected Behavior

A description of what you expected to happen.

Actual Behavior

--- FAIL: TestFeatures/PURL_functions (6.75s)
    suite.go:527: 1 error occurred:
        	* 
        - Snapshot - 0
        + Received + 1
        
        - time="${TIMESTAMP}" level=error msg="Parsing PURL \"this-is-not-a-valid-purl\" failed: purl scheme is not \"pkg\": \"\""
        + time="${TIMESTAMP}+01:00" level=error msg="Parsing PURL \"this-is-not-a-valid-purl\" failed: purl scheme is not \"pkg\": \"\""
          Error: success criteria not met
          ↵
        
        at ../../../../../../../../../../../../../tmp/tmp.GHLYxwb0uo/features/__snapshots__/validate_image.snap:3342

Possible Solution

Looks like custom formatter should be implemented.

[lcarva]

NOTE: When this was previously encountered, a change was made to the regex. That might also be the answer here.

If we go with the approach of a custom formatter, let's be sure to clean that regex.