fix(kv-store): lazy-load skipped browser benchmark deps (#24108)

## Summary

- Investigated the `merge-train/spartan-v5` dequeue for train PR #24053.
- Latest dequeue was from merge-group CI, not a merge conflict: #24053
is currently mergeable/clean on `merge-train/spartan-v5`.
- The failing merge-group run was `27576008840` on
`gh-readonly-queue/v5-next/pr-24053-fc2322d6...`, failing `ci/x3-full`
via `yarn-project/kv-store/scripts/run_test.sh
src/bench/sqlite-opfs-encrypted/map_bench.test.ts`.
- Root cause: skipped-by-default browser benchmarks still imported
SQLite/OPFS and shared benchmark dependencies at module load, so normal
CI test discovery could fail before the `describe.skip` path.
- Fix: lazy-load benchmark dependencies only when `VITE_BENCH=1` for the
IndexedDB, SQLite-OPFS, and encrypted SQLite-OPFS map benchmarks.

Failed dashboard log: http://ci.aztec-labs.com/dbe70cb905f2df69

## Verification

- `CI=1 PATH="$HOME/.cargo/bin:$PATH" scripts/run_test.sh
src/bench/sqlite-opfs-encrypted/map_bench.test.ts` from
`yarn-project/kv-store` passes with the benchmark skipped.
- `CI=1 PATH="$HOME/.cargo/bin:$PATH" scripts/run_test.sh
src/bench/sqlite-opfs/map_bench.test.ts` passes with the benchmark
skipped.
- `CI=1 PATH="$HOME/.cargo/bin:$PATH" scripts/run_test.sh
src/bench/indexeddb/map_bench.test.ts` passes with the benchmark
skipped.
- `yarn format kv-store --check` passes.

Notes: the requested root `./bootstrap.sh ci` is not a valid bootstrap
command in this checkout (`Unknown command: ci`). I also tried the
apparent CI equivalent, `./bootstrap.sh ci-full-no-test-cache`; it did
not complete in this container because the local CI engine/tooling
failed before reaching these tests.

---
*Created by
[claudebox](https://claudebox.work/v2/sessions/72862d04194777fa) ·
group: `slackbot`*

Author: AztecBot

yarn-project/kv-store/src/bench/indexeddb/map_bench.test.ts

@@ -3,15 +3,16 @@
  * Skipped by default; set `VITE_BENCH=1` to run (or invoke this file directly
  * via `yarn test:browser src/bench/indexeddb/map_bench.test.ts`).
  */
-import { createLogger } from '@aztec/foundation/log';
-
-import { AztecIndexedDBStore } from '../../indexeddb/store.js';
-import { mockLogger } from '../../interfaces/utils.js';
-import { describeAztecMapBench } from '../shared_map_bench.js';
-
 const shouldRun = (import.meta as ImportMeta & { env?: { VITE_BENCH?: string } }).env?.VITE_BENCH === '1';
 
 if (shouldRun) {
+  const [{ createLogger }, { AztecIndexedDBStore }, { mockLogger }, { describeAztecMapBench }] = await Promise.all([
+    import('@aztec/foundation/log'),
+    import('../../indexeddb/store.js'),
+    import('../../interfaces/utils.js'),
+    import('../shared_map_bench.js'),
+  ]);
+
   describeAztecMapBench(
     'IndexedDB',
     () => AztecIndexedDBStore.open(mockLogger, undefined, true),

yarn-project/kv-store/src/bench/sqlite-opfs-encrypted/map_bench.test.ts

@@ -9,15 +9,16 @@
  *
  * Skipped by default; set VITE_BENCH=1 (and VITE_SQLITE_OPFS=1) to run.
  */
-import { createLogger } from '@aztec/foundation/log';
-
-import { mockLogger } from '../../interfaces/utils.js';
-import { AztecSQLiteOPFSStore } from '../../sqlite-opfs/store.js';
-import { describeAztecMapBench } from '../shared_map_bench.js';
-
 const shouldRun = (import.meta as ImportMeta & { env?: { VITE_BENCH?: string } }).env?.VITE_BENCH === '1';
 
 if (shouldRun) {
+  const [{ createLogger }, { mockLogger }, { AztecSQLiteOPFSStore }, { describeAztecMapBench }] = await Promise.all([
+    import('@aztec/foundation/log'),
+    import('../../interfaces/utils.js'),
+    import('../../sqlite-opfs/store.js'),
+    import('../shared_map_bench.js'),
+  ]);
+
   describeAztecMapBench(
     'SQLite-OPFS (chacha20)',
     () => {

yarn-project/kv-store/src/bench/sqlite-opfs/map_bench.test.ts

@@ -3,15 +3,16 @@
  * Skipped by default; set `VITE_BENCH=1` to run (or invoke this file directly
  * via `yarn test:browser src/bench/sqlite-opfs/map_bench.test.ts`).
  */
-import { createLogger } from '@aztec/foundation/log';
-
-import { mockLogger } from '../../interfaces/utils.js';
-import { AztecSQLiteOPFSStore } from '../../sqlite-opfs/store.js';
-import { describeAztecMapBench } from '../shared_map_bench.js';
-
 const shouldRun = (import.meta as ImportMeta & { env?: { VITE_BENCH?: string } }).env?.VITE_BENCH === '1';
 
 if (shouldRun) {
+  const [{ createLogger }, { mockLogger }, { AztecSQLiteOPFSStore }, { describeAztecMapBench }] = await Promise.all([
+    import('@aztec/foundation/log'),
+    import('../../interfaces/utils.js'),
+    import('../../sqlite-opfs/store.js'),
+    import('../shared_map_bench.js'),
+  ]);
+
   describeAztecMapBench(
     'SQLite-OPFS',
     () => AztecSQLiteOPFSStore.open(mockLogger, undefined, true),