Handled setting up free trial offers

[rshbhgrg]

refs https://github.com/TryGhost/Team/issues/1726

• updates offer type validation to include trial
• add offer duration validation which includes trial for free trial offers
• updates offer setup to allow new trial as discount type, was prev only fixed and percent
• updates offer setup to allow amount as free trial days value
• updates offer setup to allow trial as discount duration value for trial offers, was prev only once/forever/repeating
• free trial offers don't need a stripe coupon created for them, checkout sessions for free trial offers ignore stripe coupon and directly pass the trial days value
• trial days of an offer take precedence over trial days added as default to a tier

[github-actions[bot]]

It looks like this PR contains a migration 👀 Here's the checklist for reviewing migrations:

General requirements

• [ ] Satisfies idempotency requirement (both up() and down())
• [ ] Does not reference models
• [ ] Filename is in the correct format
• [ ] Targets the next minor version
• [ ] All code paths have appropriate log messages
• [ ] Uses the correct utils
• [ ] Contains a minimal changeset
• [ ] Does not mix DDL/DML operations

Schema changes

• [ ] Both schema change and related migration have been implemented
• [ ] For index changes: has been performance tested for large tables
• [ ] For new tables/columns: fields use the appropriate predefined field lengths
• [ ] For new tables/columns: field names follow the appropriate conventions
• [ ] Does not drop a non-alpha table outside of a major version

Data changes

• [ ] Mass updates/inserts are batched appropriately
• [ ] Does not loop over large tables/datasets
• [ ] Defends against missing or invalid data
• [ ] For settings updates: follows the appropriate guidelines

[codecov[bot]]

Codecov Report

Merging #15202 (f7bee77) into main (fa25b72) will increase coverage by 0.04%. The diff coverage is 74.57%.

@@            Coverage Diff             @@
##             main   #15202      +/-   ##
==========================================
+ Coverage   52.69%   52.73%   +0.04%     
==========================================
  Files        1354     1354              
  Lines       86695    86733      +38     
  Branches     9716     9727      +11     
==========================================
+ Hits        45682    45737      +55     
+ Misses      40962    40946      -16     
+ Partials       51       50       -1     

Impacted Files	Coverage Δ
ghost/members-api/lib/controllers/router.js	0.00% <0.00%> (ø)
ghost/offers/lib/application/OfferMapper.js	0.00% <0.00%> (ø)
ghost/offers/lib/application/OfferRepository.js	0.00% <0.00%> (ø)
ghost/payments/lib/payments.js	0.00% <0.00%> (ø)
ghost/core/core/server/data/schema/schema.js	100.00% <100.00%> (ø)
ghost/offers/lib/domain/models/Offer.js	94.29% <100.00%> (+0.15%)	:arrow_up:
ghost/offers/lib/domain/models/OfferAmount.js	100.00% <100.00%> (ø)
ghost/offers/lib/domain/models/OfferDuration.js	100.00% <100.00%> (ø)
ghost/offers/lib/domain/models/OfferType.js	100.00% <100.00%> (ø)
ghost/core/core/server/data/db/connection.js	82.45% <0.00%> (-1.16%)	:arrow_down:
... and 8 more

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