chg: update the enforced 30gwei for gas related configs to 25gwei

[pratikspatil024]

Description

This is a draft PR, please do not merge it yet. Thanks!

This PR updated the enforced 30gwei gas for txpool.pricelimit, miner.gasprice and gpo.ignoreprice to 25gwei.

Previous PR - maticnetwork/bor#1264
PR in erigon - ledgerwatch/erigon#10930

Changes

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Breaking changes

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Nodes audience

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Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply
• Created a task in Jira and informed the team for implementation in Erigon client (if applicable)
• Includes RPC methods changes, and the Notion documentation has been updated

Cross repository changes

• This PR requires changes to heimdall
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• This PR requires changes to matic-cli
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Testing

• I have added unit tests
• I have added tests to CI
• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai/amoy
• I have created new e2e tests into express-cli

Manual tests

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Additional comments

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[ssandeep]

Why does this have to be changed to 26?

[marcello33]

@ssandeep, I have a comment in the code for the tests, reporting it here

	Given the introduction of `BorDefaultTxPoolPriceLimit=30gwei`,
	we set `testTxPoolConfig.PriceLimit = 1` to avoid rewriting all `legacypool_test.go` tests,
	causing code divergence from geth, as this has been widely tested on different networks.
	Also, `worker_test.go` has been adapted to reflect such changes.
	Furthermore, config test can be found in `TestTxPoolDefaultPriceLimit`

Basically we adopted some workarounds not to change the whole structure of tests.
In this one specifically, with fee=1, geth used 2 to make the test pass.
With 30gwei I just modified it to be 32.
So now with 25, changing it to something just higher than it would work.

[pratikspatil024]

Closing in favour of bor#1285