chore: pull cometbft v0.34.35 (#1495)

Closes #1468 by
pulling upstream
[v0.34.35](https://github.com/cometbft/cometbft/releases/tag/v0.34.35)
with these notable merge conflicts:
- Our repo upgraded Go past what upstream has so I choose to retain the
more recent Go version

And these changes to make unit tests pass:
1. Refactor CI to run all tests in one execution. It takes the same time
([4
mins](https://github.com/celestiaorg/celestia-core/actions/runs/11038290102/job/30661243408?pr=1495))
as it [previously
did](https://github.com/celestiaorg/celestia-core/actions/runs/10956425121).
But now it's easier to reason about the flakes.
2. Included #1503
3. Included #1501

## FLUPs
1. #1504
2. Opens #1502 and
skips that test

## Testing

I used go mod replace and verified that celestia-app can use this
version of celestia-core.
- [x] `single-node.sh`
- [x] `mocha.sh`

---------

Signed-off-by: dependabot[bot] <[email protected]>
Signed-off-by: Thane Thomson <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Co-authored-by: Sergio Mena <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jasmina Malicevic <[email protected]>
Co-authored-by: Lasaro <[email protected]>
Co-authored-by: Thane Thomson <[email protected]>
Co-authored-by: mmsqe <[email protected]>
Co-authored-by: yihuang <[email protected]>
Co-authored-by: Steven Ferrer <[email protected]>
Co-authored-by: Chill Validation <[email protected]>
Co-authored-by: Aliasgar Merchant <[email protected]>
Co-authored-by: Philip Offtermatt <[email protected]>
Co-authored-by: Daniel <[email protected]>
Co-authored-by: Hernán Vanzetto <[email protected]>
Co-authored-by: Adi Seredinschi <[email protected]>
Co-authored-by: Ethan Buchman <[email protected]>
Co-authored-by: Andy Nogueira <[email protected]>
Co-authored-by: Anton Kaliaev <[email protected]>
Co-authored-by: Troy Kessler <[email protected]>
Co-authored-by: forcodedancing <[email protected]>
Co-authored-by: Mikhail Zabaluev <[email protected]>
Co-authored-by: Alexsandro <[email protected]>
Co-authored-by: Alessandro <[email protected]>
Co-authored-by: Jacob Gadikian <[email protected]>

Author: 25 people

.changelog/v0.34.30/build/1351-bump-go-120.md

@@ -0,0 +1,2 @@
+- Bump Go version used to v1.20 since v1.19 has reached EOL
+  ([\#1351](https://github.com/cometbft/cometbft/pull/1351))

.changelog/v0.34.30/features/1512-metric-mempool-size-bytes.md

@@ -0,0 +1,2 @@
+- `[metrics]` Add metric for mempool size in bytes `SizeBytes`.
+  ([\#1512](https://github.com/cometbft/cometbft/pull/1512))