fix: Token distribution (matter-labs#1051)

## What ❔

Submit transactions in parallel only if using localhost

## Why ❔

To fix running tests on true L1

## Checklist

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<!-- For draft PRs check the boxes as you complete them. -->

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [x] Tests for the changes have been added / updated.
- [x] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.
- [x] Spellcheck has been run via `zk spellcheck`.
- [x] Linkcheck has been run via `zk linkcheck`.

core/tests/ts-integration/src/context-owner.ts

@@ -328,7 +328,13 @@ export class TestContextOwner {
 
         this.reporter.debug(`Sent ${l1TxPromises.length} initial transactions on L1`);
 
-        await Promise.all(l1TxPromises);
+        if (this.env.network === 'localhost') {
+            await Promise.all(l1TxPromises);
+        } else {
+            for (const promise of l1TxPromises) {
+                await promise;
+            }
+        }
         this.reporter.finishAction();
     }
 
@@ -363,8 +369,8 @@ export class TestContextOwner {
             this.reporter
         );
         l2TxPromises.push(...erc20Promises);
-
         await Promise.all(l2TxPromises);
+
         this.reporter.finishAction();
     }