Add auto dismissal checker for batch preloading of policy matches

What does this MR do and why?

Add auto dismissal checker for batch preloading of policy matches.

To display a badge for findings in the MR security widget that will be automatically dismissed by a auto-dismiss policy, we need to preload the information for security findings whether or not they match any auto-dismiss policies.

References

1. Support Security::Finding for auto-dismiss matc... (!216178 - merged)
2. 👉 Add auto dismissal checker for batch preloading... (!216340)
3. Expose matches_auto_dismiss_policy for FindingE... (!216342)
4. FE changes: Show an icon in MR widget for findings matched ... (!216179)

Screenshots or screen recordings

With the FE changes, the end result will be:

Before	After

MR acceptance checklist

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Related to #581394