minerva-ag: Do post update before sending apply complete to UA

[Victor-Jhong]

Summary:

• Do post-update before sending "apply complete" to UA
• In the current flow, once the BMC receives "apply complete", it sends "Active" to the MMC and immediately reinitializes MCTP. If this MCTP reinit happens while the MMC is still running its post-update steps, the two operations conflict and can cause the MMC to hang.
• By executing the post-update steps before sending "apply complete", we ensure the BMC’s MCTP reinit occurs only after post-update is fully completed.

Test Plan:

• Build code: Pass

[meta-codesync]

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