[FlyteCTL Feature] Use Launchplan with latest version for scheduled workflows

[pmahindrakar-oss]

Describe the feature/command for FlyteCTL

Currently for activating a launch plan with scheduled workflow.
Users have to

• deactivate the old launch plan version with the scheduled workflow
• register the new launch plan version with the scheduled workflow
• activate the new launch plan version with the scheduled workflow

TO reduce the number of steps the proposal is to do all this during register with additional flag

Provide a possible output or UX example

flytectl register file  *  -d development  -p flytesnacks --version v2  --enableSchedule

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[pmahindrakar-oss]

cc : @kumare3 @stephen37

[EngHabu]

Discussed offline, let's change the logic to:

• Register the new version
• Activate the new version (Admin will automatically deactivate the old LP)