Implement identifier filter

What does this MR do and why?

Implement identifier filter

This is the first version, where we don't include the dropdown. Users can perform an exact match to filter vulnerabilities by their identifiers.

References

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MR acceptance checklist

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Screenshots or screen recordings

Savas_Vedova_s_Video_-_Nov_26__2024-VEED

How to set up and validate locally

1. Enable feature flag: echo "Feature.enable(:vulnerability_filtering_by_identifier)" | rails c
2. Go to Vulnerability Report in a Project Level
3. Check the identifier filter

Here are things to verify:

• When the feature flag is turned off, terms as tokens should be turned of (searching by text)
• Identifier token accepts only exact matches for now, so searching for an identifier should filter the report accordingly
• Refreshing the page should keep the vulnerability report in the same state
• Deleting the token should reset the filter (backspace as well)

Related to #452492 (closed)