[test] add chainparams property to indicate chain allows time mocking

Summary:
Thi is a partial backport of Core PR18037 : https://github.com/bitcoin/bitcoin/pull/18037/commits/930d8375421451c8c4127608c360b0f6a0a62127

Depends on D6500

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, majcosta

Reviewed By: #bitcoin_abc, majcosta

Differential Revision: https://reviews.bitcoinabc.org/D6501