fix: reverts read_state polling expiry changes

[krpeacock]

Description

Reverts #938

This introduced a bug because the signature is being re-used while the expiry is changed each time the request is made. This conflicts with the strategy of re-using requests in order to make the polling play well with hardware wallets, leading to invalid signatures. We will revert for now and re-evaluate

Fixes SDK-1958

Checklist:

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

[github-actions]

size-limit report 📦

Path	Size
@dfinity/agent	72.59 KB (-0.26% 🔽)
@dfinity/candid	11.65 KB (0%)
@dfinity/principal	4.16 KB (0%)
@dfinity/auth-client	50.24 KB (-0.03% 🔽)
@dfinity/assets	67.83 KB (-0.3% 🔽)
@dfinity/identity	47.85 KB (-0.06% 🔽)
@dfinity/identity-secp256k1	106.87 KB (-0.22% 🔽)