Improve Error Handling for Tags

[jycor]

Changes:

• Prevent cloning from a tag through --branch option
• Return detached head error for checking out branch through cli

Fixes: #8377

[coffeegoddd]

@jycor DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
8ed8710	ok	5937457

version	total_tests
8ed8710	5937457

correctness_percentage
100.0

[coffeegoddd]

@jycor DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
cde716f	ok	5937457

version	total_tests
cde716f	5937457

correctness_percentage
100.0

[coffeegoddd]

@jycor DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
685c7a5	ok	5937457

version	total_tests
685c7a5	5937457

correctness_percentage
100.0

[fulghum]

Looks good!

[fulghum]

Suggested change

	dolt checkout %s -b {new_branch_namee}`, branchName)
	dolt checkout %s -b {new_branch_name}`, branchName)

[fulghum]

Nice error message btw! Really, really helpful to tell users exactly what command they need to run whenever we can.

[fulghum]

Do we need to only execute this logic to when cli.MoveFlag is present? My understanding is that we don't document the MoveFlag, but the CLI uses it when it calls dolt_checkout() to move the working set contents? It seems like we'd want to return the same error message if you tried to check out a tag from the SQL interface, too, right? I may just be missing something on how the MoveFlag is used though.

[fulghum]

(minor) Might be nice if there was a more prescriptive error message here, like we use in dolt checkout to tell the user exactly what they need to run in order to checkout a tag as a new branch.

[coffeegoddd]

@jycor DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
1b36adf	ok	5937457

version	total_tests
1b36adf	5937457

correctness_percentage
100.0

[coffeegoddd]

@coffeegoddd DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
d309e8d	ok	5937457

version	total_tests
d309e8d	5937457

correctness_percentage
100.0