samples(storagecontrol): add storagecontrol managed folder samples

[ddelgrosso1]

Fixes #14305

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This change is 

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• google/cloud/storagecontrol/v2/samples/storage_control_managed_folder_samples.cc:48, tag storage_control_managed_folder_create
• google/cloud/storagecontrol/v2/samples/storage_control_managed_folder_samples.cc:67, tag storage_control_managed_folder_delete
• google/cloud/storagecontrol/v2/samples/storage_control_managed_folder_samples.cc:85, tag storage_control_managed_folder_get
• google/cloud/storagecontrol/v2/samples/storage_control_managed_folder_samples.cc:103, tag storage_control_managed_folder_list

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[coryan]

The code looks great, thanks.

I am sad that we are spending time on this type of example. We should be thinking about either (1) using snippetgen, or (2) write a product-neutral, and resource-neutral examples. That is, we should have an example that is the prototypical "CreateFoo()", and another for "DeleteFoo()" and another for "Using LROs".

[ddelgrosso1]

@coryan I agree. These are almost an exact copy of the folder samples I did last week with a few names changed around.

I was having some side conversation recently because some languages (i.e. node) already have generated samples for folders / managed folders but we are still hand re-writing them. It seems like we could spend the same time improving the toolset that is generating samples so that they are auto generated to our standard and then bring the tools / samples across all languages.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.68%. Comparing base (3739c56) to head (d62188b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14356      +/-   ##
==========================================
+ Coverage   93.19%   93.68%   +0.48%     
==========================================
  Files        2191     2280      +89     
  Lines      192367   203329   +10962     
==========================================
+ Hits       179282   190480   +11198     
+ Misses      13085    12849     -236     

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