feat: limit open-ended vectors for covenants

[hansieodendaal]

Description

Limited open-ended vectors to guard against malicious network messages in:

• covenants

Motivation and Context

This is a defense-in-depth exercise.

How Has This Been Tested?

Existing unit tests pass.

What process can a PR reviewer use to test or verify this change?

Code review

Breaking Changes

• [x] None
• [ ] Requires data directory on base node to be deleted
• [ ] Requires hard fork
• [ ] Other - Please specify

[github-actions[bot]]

Test Results (CI)

    3 files    129 suites   35m 28s :stopwatch: 1 306 tests 1 306 :white_check_mark: 0 :zzz: 0 :x: 3 904 runs  3 904 :white_check_mark: 0 :zzz: 0 :x:

Results for commit cb2b1282.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Test Results (Integration tests)

37 tests   37 :white_check_mark:  16m 5s :stopwatch: 11 suites   0 :zzz:  2 files     0 :x:

Results for commit cb2b1282.

:recycle: This comment has been updated with latest results.