[ENHANCEMENT] Automatic check for updates to run after X time after the last check (manual/auto)

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Please confirm these before moving forward

• I have searched for my feature proposal and not found a work-in-progress/duplicate/resolved/discarded issue.
• This improvements refers to an existing feature. If you want to suggest a new feature, please use this template
• This improvements is not a bug. If you want to report a bug, please use this template

Describe the improvement

It would be nice to have the option to set whether automatic checks for updates run at regular intervals regardless of the last check (I think this is the current behaviour), or after the set amount of time since the last check, be it automatic or manual.

E.g. Check for updates set to 6 hours, manually refresh after 4, the automatic check is then performed 6 hours after this last check as opposed to in 2 hours.

Describe how this improvement could help users.

If a user is someone to check for updates manually as well as has automatic checks enabled, WingetUI could not check for updates more than is necessary, one could argue.

In an extreme case, if set to check for updates every 10 minutes and you manually check on the 9th minute, WingetUI arguably unnecessarily checks again at the 10th minute. With this enhancement, the automatic check would happen on the 19th minute.

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Just verified:

In an extreme case, if set to check for updates every 10 minutes and you manually check on the 9th minute, WingetUI arguably unnecessarily checks again at the 10th minute. With this enhancement, the automatic check would happen on the 19th minute.

Still is the behaviour in v3.0.0.