[Tracking]: Improve CLI versioning

[JReinhold]

This is a tracking issue to track the work on improving the CLI versioning, specifically making the init, upgrade and sandbox commands respect and use the version they are being invoked as.

Milestone 1: init - Pairing

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1. Always initialize the version that the CLI is invoked as, instead of just latest or next #25501
   +0
2. Prompt if CLI detects that it is being invoked without a version identifier, eg. npx storybook init #25454
   +0

Milestone 2: upgrade - Jeppe

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1. Remove --tag and --prerelease flags
2. Remove usage of flags - including in sattelite repos like test-runner
3. Always upgrade to the version that the CLI is invoked as, instead of using the flags
4. Throw an error if trying to upgrade to a version that matches or is below the version already installed in the project
5. Optional: run doctor at the end of upgrade
6. Detect existing version of @storybook/cli to avoid multiple versions detected

Milestone 3: sandbox - Norbert

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1. Always create sandbox with the version that the CLI is invoked as, instead of just latest or next #25559
   +0
   
2. Show a warning if sandbox is not invoked as either latest or next, as that is usually what the user wants
3. Handle sandbox with specific version
4. Remove usage of --branch flag - including in sattelite repos like test-runner
5. Bug: initiating happens in the CWD and not in the newly created sandbox directory, which it should
6. Bug: Sandbox versions lag behind because they are only generated daily #25603
   bug cli +2
   

Milestone 4: Canary releases - Jeppe

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1. Test that this works for canaries now
2. Add line to generated PR description like "To try out this canary run npx storybook@<THE_CANARY_VERSION> sandbox"

Related Issue: Ensure these are fixed and close them - Jeppe

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1. [Bug]: can not init storybook to use old version like 6.0 #22214
   bug cli +2

Milestone 5: Backport to 7.6

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1. Backport init work to 7.6 #25521
   +0
   
2. Backport upgrade work to 7.6 #25571
   +0
   
3. Backport sandbox work to 7.6 #25572
   +0
   
4. Test init, upgrade and sandbox in a telescoping PR to main, using Verdaccio to trick npx. #25577
   +0
   
5. Release 7.6 patch