feat: extend auxData to 96 bytes

[rickstaa]

What does this pull request do? Explain your changes. (required)

Allow a 64–96 byte auxData field to support additional on-chain metadata. This was part of the protocol work to distinguish different job types on-chain (see this tech spec: https://www.notion.so/On-Chain-Ticket-Job-Type-Distinction-2bf660222d08814d89b1fa7221ad3291).

This proposal was originally drafted as a protocol change that would not materially increase gas costs or code complexity. However, given the new requirement to also encode payment clearinghouse information on-chain, please review this approach with @mehrdadmms, @yondonfu, and @j0sh to confirm whether this is still the preferred solution.

Specific updates (required)

• Extended auxData field to accept 96 bytes.
• Updated tests.

How did you test each of these updates (required)

Not fully tested, however made sure tests pass.

Does this pull request close any open issues?

Checklist:

• README and other documentation updated
• All tests using yarn test pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00000%. Comparing base (d03671e) to head (8f548fa).

Additional details and impacted files

@@               Coverage Diff               @@
##                delta         #652   +/-   ##
===============================================
  Coverage   100.00000%   100.00000%           
===============================================
  Files              29           29           
  Lines            1331         1331           
  Branches          223          223           
===============================================
  Hits             1331         1331           

Files with missing lines	Coverage Δ
contracts/pm/mixins/MixinTicketProcessor.sol	100.00000% <100.00000%> (ø)

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Files with missing lines	Coverage Δ
contracts/pm/mixins/MixinTicketProcessor.sol	100.00000% <100.00000%> (ø)

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