enh(ci): add github cache scheduled pruning

[tuntoja]

Description

• split from enh(ci): add github cache clean #3267
• add scheduled prunning

Fixes #MON-196861

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[Tpo76]

🤖 This is an automatic comment generated by an internal tool.

Complexity Classification: Standard

Justification: Automatic classification failed; defaulting to standard.

Metric	Value
WIP Points	2
SLA Track	Standard SLA (2 work days)
First review SLA	1 work day

A maintainer can override this classification at any time.