[Themes] Remove template type flag and related functionality

[jamesmengo]

WHY are these changes introduced?

Fixes #0000

WHAT is this pull request doing?

How to test your changes?

Post-release steps

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[jamesmengo]

• [Themes] Add TODOs for template generator improvements #5101
• [Themes] Remove template type flag and related functionality #5100 👈 (View in Graphite)
• [Themes] Add template generation with liquid and json support #5099
• [Themes] Add support for generating liquid and JSON section files #5090
• Feat: Generate Liquid Blocks #5088
• Add theme generation commands for blocks, sections, and templates #5081 : 1 other dependent PR (#5089 )
• Add --dev-preview flag to theme init for framework theme support #5079
• main

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[github-actions]

Unused types (3)

Filename	types
packages/theme/src/cli/services/generate/blocks.ts	BlockGeneratorOptions
packages/theme/src/cli/services/generate/sections.ts	SectionGeneratorOptions
packages/theme/src/cli/services/generate/templates.ts	TemplateGeneratorOptions

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	75.28%	8781/11664
🟡	Branches	70.59%	4281/6065
🟡	Functions	74.98%	2295/3061
🟡	Lines	75.84%	8302/10947

Test suite run success

1981 tests passing in 896 suites.

Report generated by 🧪jest coverage report action from e92b50c