refactor(programmatic): cleanup useProgrammatic composable

[mlmoravek]

Part of #829
Fixes #828

Proposed Changes

• cleanup useProgrammatic composable
• update useClickOutside and useEventListener composables
• remove unnecessary onCancel prop from loading; modal; notification; sidebar

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[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 120 lines in your changes missing coverage. Please review.

Project coverage is 18.23%. Comparing base (484cfe8) to head (f1caeca).
Report is 77 commits behind head on develop.

Files	Patch %	Lines
packages/oruga/src/components/modal/Modal.vue	0.00%	20 Missing and 12 partials ⚠️
packages/oruga/src/components/sidebar/Sidebar.vue	0.00%	20 Missing and 11 partials ⚠️
packages/oruga/src/composables/useProgrammatic.ts	0.00%	17 Missing and 12 partials ⚠️
packages/oruga/src/components/loading/Loading.vue	0.00%	8 Missing and 4 partials ⚠️
...src/components/notification/NotificationNotice.vue	0.00%	5 Missing and 3 partials ⚠️
packages/oruga/src/composables/useEventListener.ts	76.19%	4 Missing and 1 partial ⚠️
...ackages/oruga/src/components/dropdown/Dropdown.vue	90.90%	1 Missing ⚠️
...c/components/loading/examples/programmatically.vue	0.00%	1 Missing ⚠️
packages/oruga/src/composables/useClickOutside.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #833       +/-   ##
============================================
- Coverage    56.71%   18.23%   -38.49%     
============================================
  Files           30      292      +262     
  Lines         1511     7370     +5859     
  Branches       544     2149     +1605     
============================================
+ Hits           857     1344      +487     
- Misses         654     5066     +4412     
- Partials         0      960      +960     

Flag	Coverage Δ
oruga-next	18.23% <20.00%> (-38.49%)	⬇️

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