chore(builder): Fix priority fee ordering violations in flashblocks block building

[cody-wang-cb]

We see a bunch of fee violation these days, from our internal monitoring and reported by others

There's a possible fix but not released yet (paradigmxyz/reth#19940) where blocked transactions break nonce chain tracking.

Rather than waiting for the official release (which requires baking and unsure about the release schedule), doing a workaround now is to check at the execution level for violation, and skip the txn when found

slack context: https://coinbase.slack.com/archives/C06RRAWRCTX/p1768415995939549?thread_ts=1768403579.942579&cid=C06RRAWRCTX

[cb-heimdall]

✅ Heimdall Review Status

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Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[meyer9]

I'd wait for one other reviewer, but this makes sense to me. Can you also open a PR/issue dependent on this one for removing this workaround? #375

[refcell]

This looks good, but maybe it's worth making this configurable via an env var? This way it can be toggled off/on if needed?

[cody-wang-cb]

@meyer9 just opened this issue, lmk if this makes sense

[refcell]

This looks good to me! Thanks for adding the config option