james-prysm cf94ccbf72 node fallback cleanup (#16316) ...

**What type of PR is this?**

 Other

**What does this PR do? Why is it needed?**

Follow up to https://github.com/OffchainLabs/prysm/pull/16215 this pr
improves logging, fixes stuttering in package naming, adds additional
unit tests, and deduplicates fallback node code.

**Which issues(s) does this PR fix?**

fixes a potential race if reconnecting to the same host very quickly
which has a stale connection still.

**Other notes for review**

**Acknowledgements**

- [x] I have read
[CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment
file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description with sufficient context for reviewers
to understand this PR.
- [x] I have tested that my changes work as expected and I added a
testing plan to the PR description (if applicable).

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..

BUILD.bazel

node fallback cleanup (#16316)

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fallback_test.go

node fallback cleanup (#16316)

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fallback.go

node fallback cleanup (#16316)

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log.go

node fallback cleanup (#16316)

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