Remove wildcards from replacements when searching segments by slug

[sausage-todd]

Changes proposed ✍️

What

🤖 Generated by Copilot at 5b2b365

Fixed a bug in the segmentRepository that affected segment queries by slug. Refactored the query parameters to use exact matches instead of wildcards.
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🤖 Generated by Copilot at 5b2b365

No more false segments in the dark
We fixed the bug that tore us apart
We removed the wildcards from the slugs
We found the truth in the segmentRepository

Why

How

🤖 Generated by Copilot at 5b2b365

• Remove wildcard characters from parent_slug and grandparent_slug parameters in findSegments method to fix bug where segments with similar slugs were returned (link, link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.