fix(refresher): quickly swiping down no longer causes duplicate refresh

[liamdebeasi]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue URL: resolves #25418

See #25418 (comment) for explanation of why this happens

What is the new behavior?

• Reset this.progress to 0 in the onStart callback. This is the same as what the non-native refreshers do.
• This uncovered another issue where quickly swiping to complete caused an error because we were not disabling the gesture correctly. I changed this to always disable the gesture in onEnd and then have each animation re-enable the gesture (the snapback animations)

Does this introduce a breaking change?

• Yes
• No

Other information

Note: This fix cannot be tested reliably on CI because it requires swiping quickly which cannot be guaranteed on CI.