chore: Create fixtures folder in E2E

[LHerskind]

Creates a folder for fixtures in E2E and moves:

• dumps
• fixtures.ts
• utils
• cross_chain_test_harness.ts

Not moving the cheat_codes.ts as @rahul-kothari was in progress of moving that to another location already.

Checklist:

Remove the checklist to signal you've completed it. Enable auto-merge if the PR is ready to merge.

• If the pull request requires a cryptography review (e.g. cryptographic algorithm implementations) I have added the 'crypto' tag.
• I have reviewed my diff in github, line by line and removed unexpected formatting changes, testing logs, or commented-out code.
• Every change is related to the PR description.
• I have linked this pull request to relevant issues (if any exist).

[Maddiaa0]

shipit