test: Schedule Create POSITIVE tests from test plan

[ibankov]

Description:
Covering ScheduleCreate - Positive Scenarios from the test plan

Also refactor ScheduleLongTermSign and ScheduleLongTermExecute to use hapiTest() instead of given()/when()/then()

Related issue(s):
#16737

Fixes #

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.04% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0759d3d)	97519	63701	65.32%
Head commit (305b848)	97519 (+0)	63743 (+42)	65.36% (+0.04%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#16797)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.67%. Comparing base (0759d3d) to head (305b848).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #16797      +/-   ##
=============================================
+ Coverage      63.62%   63.67%   +0.05%     
- Complexity     20401    20425      +24     
=============================================
  Files           2537     2537              
  Lines          94754    94754              
  Branches        9904     9904              
=============================================
+ Hits           60285    60338      +53     
+ Misses         30863    30821      -42     
+ Partials        3606     3595      -11     

see 11 files with indirect coverage changes