fix: update MAX_EVENT_SERIALIZATION_LENGTH and re-enable TXE tests in CI (backport #21020) (#21027)

Backport of #21020
to v4.

Cherry-pick applied cleanly — no conflicts.

## Summary

Two fixes:

### 1. Fix `MAX_EVENT_SERIALIZATION_LENGTH` mismatch
PR #20840 changed `MAX_EVENT_LEN` from 12 to 10 in
`yarn-project/txe/src/rpc_translator.ts` but forgot to update the
corresponding Noir constant `MAX_EVENT_SERIALIZATION_LENGTH` in
`txe_oracles.nr`. This caused the TXE oracle to return `10 * 5 = 50`
fields while the Noir oracle declaration expected `12 * 5 = 60` fields,
crashing the `emit_and_discover_event` test.

### 2. Re-enable TXE-dependent noir tests in CI
The `build_and_test` function in `bootstrap.sh` had a guard that only
ran TXE tests when no argument was passed, but CI always calls
`build_and_test fast` or `build_and_test full`. This fix removes the
conditional so TXE tests run in all CI modes.

ClaudeBox log: http://ci.aztec-labs.com/ed670f8e16fb711b-1

Author: AztecBot

bootstrap.sh

@@ -307,11 +307,9 @@ function build_and_test {
     if [ "$finished" == "$make_pid" ]; then
       make_pid=
 
-      if [ -z "${1:-}" ]; then
-        # TODO: Handle this better to they can be run as part of the Makefile dependency tree.
-        start_txes
-        make noir-projects-txe-tests
-      fi
+      # TODO: Handle this better so they can be run as part of the Makefile dependency tree.
+      start_txes
+      make noir-projects-txe-tests
 
       # Signal tests complete, handled by parallel -E STOP.
       echo STOP >> $test_cmds_file

noir-projects/aztec-nr/aztec/src/test/helpers/txe_oracles.nr

@@ -11,7 +11,7 @@ use crate::protocol::{
 };
 
 global MAX_PRIVATE_EVENTS_PER_TXE_QUERY: u32 = 5;
-global MAX_EVENT_SERIALIZATION_LENGTH: u32 = 12;
+global MAX_EVENT_SERIALIZATION_LENGTH: u32 = 10;
 
 pub unconstrained fn deploy<let M: u32, let N: u32, let P: u32>(
     path: str<N>,

noir-projects/noir-contracts-comp-failures/contracts/invalid_note/expected_error

@@ -1 +1 @@
-InvalidNote has a packed length of 10 fields, which exceeds the maximum allowed length of 9 fields
+InvalidNote has a packed length of 9 fields, which exceeds the maximum allowed length of 8 fields