feat(webhooks): add confirmationMode subscription option

[EnriqueL8]

Proposed changes

Fixes #1770

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Types of changes

• Bug fix
• New feature added
• Documentation Update

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Please make sure to follow these points

• I have read the contributing guidelines.
• I have performed a self-review of my own code or work.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generates no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• My changes have sufficient code coverage (unit, integration, e2e tests).

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[peterbroadhurst]

This looks great to me @EnriqueL8 - very minor comment, but no functional concerns.

Particularly liked the Markdown docs updated on the confirmation modes. Think that's a great addition to help users choose the right mode.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
internal/coremsgs/en_error_messages.go	0.00% <ø> (ø)
internal/coremsgs/en_struct_descriptions.go	0.00% <ø> (ø)
internal/events/webhooks/webhooks.go	100.00% <100.00%> (ø)

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