fix(item-sliding): account for options added before watcher

[liamdebeasi]

Issue number: resolves #27910

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What is the current behavior?

There is an edge case in our ion-item-sliding code where options can be added after the querySelectorAll has been run in updateOptions but before watchForOptions has been called which causes us to miss the newly created options. These options can never be shown as a result.

What is the new behavior?

• watchForOptions is called before the initial updateOptions call so that we can re-run updateOptions in the event that options are added while that first call is running.

Does this introduce a breaking change?

• Yes
• No

Other information

Dev build: 7.2.2-dev.11690983626.19a2a8cb

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