wallet, rpc, gui: Allow users to manually rebroadcast a wallet transaction #36481

From the discussion in #36403, it is clear that there needs to be a way for users to rebroadcast a transaction. Currently, the way to do so requires getting the raw transaction, getting the hex, and using sendrawtransaction. This PR adds rebroadcastwallettx RPC that takes a txid to attempt to rebroadcast that single transaction. An action is also added to the GUI menu for each transaction to do the same.

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The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

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External sites

• Code coverage & benchmarks: https://corecheck.dev/bitcoin/bitcoin/pulls/36481
• Ralph review <img src=https://review.fish.foo/assets/bitcoin/bitcoin/36481.png alt="Ralph review status"> https://git.fish.foo/bitcoin/bitcoin/pulls/36481#author-ralph

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Conflicts

Reviewers, this pull request conflicts with the following ones:

• #36482 _{<img src="https://drahtbot.space/ack_count/bitcoin/bitcoin/36482.svg">} (wallet: Only broadcast resubmitted transactions that were added to the mempool by achow101)
• #36330 _{<img src="https://drahtbot.space/ack_count/bitcoin/bitcoin/36330.svg">} (wallet: don't resubmit transactions under -privatebroadcast by instagibbs)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

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🚧 At least one of the CI tasks failed. _{Task tidy: https://github.com/bitcoin/bitcoin/actions/runs/37848508934/job/113555303677} _{LLM reason (✨ experimental): CI failed because clang-tidy flagged an ignored return value from rebroadcastTransaction() in qt/transactionview.cpp:408 (warnings treated as errors).}

<details><summary>Hints</summary>

Try to run the tests locally, according to the documentation. However, a CI failure may still happen due to a number of reasons, for example:

• Possibly due to a silent merge conflict (the changes in this pull request being incompatible with the current code in the target branch). If so, make sure to rebase on the latest commit of the target branch.

• A sanitizer issue, which can only be found by compiling with the sanitizer and running the affected test.

• An intermittent issue.

Leave a comment here, if you need help tracking down a confusing failure.

</details>

concept ACK

Concept ACK

Whatever the solution of the existing issues with rebroadcast will be, giving the users the option to rebroadcast transactions manually is useful in all of these scenarios.