Add tests for `set_max_oracle_age`

[Levi-Ojukwu]

Description:

The set_max_oracle_age function needs tests to verify it correctly affects the oracle freshness check.

Why it matters: Oracle age configuration is a security parameter.

Acceptance Criteria:

• Test setting max oracle age
• Test that it affects fund_invoice oracle check
• Test unauthorized access rejection

Relevant Files: contracts/invoice_liquidity/src/tests_oracle_freshness.rs

---

[vic2430]

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I would like to work on this issue

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[cristianooR7]

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hello maintainer, i would like to work on this

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[chizzy192]

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helloo :)
can you trust me with this?
I'd love to work on it.

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[devJaja]

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I can handle this issue

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