chore: v1 agent compatibility with v2 actor tests

[krpeacock]

Description

Due to some changes in the return types of the HttpAgent call response, this test ensures backwards compatibility with v1 agents is preserved

How Has This Been Tested?

New integration test suite added in e2e tests

Checklist:

• [x] My changes follow the guidelines in CONTRIBUTING.md.
• [x] The title of this PR complies with Conventional Commits.
• [x] I have edited the CHANGELOG accordingly.
• [x] I have made corresponding changes to the documentation.

[github-actions[bot]]

size-limit report 📦

Path	Size
@dfinity/agent	85.99 KB (-0.01% 🔽)
@dfinity/candid	13.58 KB (0%)
@dfinity/principal	4.97 KB (0%)
@dfinity/auth-client	60.84 KB (0%)
@dfinity/assets	80.65 KB (+0.01% 🔺)
@dfinity/identity	58.03 KB (0%)
@dfinity/identity-secp256k1	266.58 KB (0%)