Testnet Missed upgrade steps

[TxCorpi0x]

Description

This pull request introduces a patch upgrade for the v6 release, focusing on updating the PSE module parameters to testnet defaults and clarifying which migrations have already been performed in previous upgrades. The upgrade handler is renamed and unnecessary migration steps are commented out to prevent redundancy.

Upgrade handler changes:

• Renamed the upgrade handler from "v6" to "v6-params-patch" to reflect its purpose as a patch.
• Updated the StoreUpgrades and migration steps to comment out actions that were already completed in the previous v6.0.0 upgrade, preventing duplicate execution and clarifying upgrade history. [1] [2]

PSE module Changes:

• Added the TestnetV6Patch function in pse_init.go to set PSE module parameters to testnet defaults, and integrated this step into the upgrade handler. [1] [2]

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

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