chore: create WorkloadType enum and Go config + constraints structs

[amandavialva01]

Ticket

CM-501

Description

This PR implements the following:

• Define WorkloadType enum in Protobuf and create Go constants that map to and from the Protobuf enum.

• Define Go Constraints struct that’s agnostic to workload type

• Define Go ExperimentTaskConfigPolicy and NTSCTaskConfigPolicy structs that allows parsing configs and constraints at the API level for the respective workload type.

Test Plan

CI passes (automated testing).

Checklist

• [ ] Changes have been manually QA'd
• [ ] New features have been approved by the corresponding PM
• [ ] User-facing API changes have the "User-facing API Change" label
• [ ] Release notes have been added as a separate file under docs/release-notes/ See Release Note for details.
• [ ] Licenses have been included for new code which was copied and/or modified from any external code

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 54.75%. Comparing base (ee269c8) to head (879e03c). Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9885      +/-   ##
==========================================
- Coverage   54.75%   54.75%   -0.01%     
==========================================
  Files        1261     1262       +1     
  Lines      156333   156337       +4     
  Branches     3600     3598       -2     
==========================================
- Hits        85604    85603       -1     
- Misses      70598    70603       +5     
  Partials      131      131              

Flag	Coverage Δ
backend	45.21% <100.00%> (-0.01%)	:arrow_down:
harness	72.62% <ø> (ø)
web	54.53% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
master/pkg/model/task_config_policy.go	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes