chore: rename protocol_tests folder to private

[trivikr]

Issue

Issue: #2939

In step 1, we prefix aws-protocoltests- to protocol tests in #2942.
In step 2, the protocol_tests folder is renamed to private in current PR.
In step 3, the generic client will be added in new folder and CI will be run on it.

Description

Renames folder protocol_tests folder to private

Testing

Verified that running yarn generate-clients generates protocol tests in private folder.

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[codecov-commenter]

Codecov Report

Merging #2943 (8f9ba3f) into main (0142e6b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2943   +/-   ##
=======================================
  Coverage   58.60%   58.60%           
=======================================
  Files         561      561           
  Lines       30272    30272           
  Branches     7452     7452           
=======================================
  Hits        17742    17742           
  Misses      12530    12530           

Impacted Files	Coverage Δ
...ate/aws-protocoltests-ec2/src/EC2ProtocolClient.ts	92.00% <ø> (ø)
...c2/src/commands/EmptyInputAndEmptyOutputCommand.ts	100.00% <ø> (ø)
...tests-ec2/src/commands/EndpointOperationCommand.ts	81.81% <ø> (ø)
.../commands/EndpointWithHostLabelOperationCommand.ts	86.36% <ø> (ø)
...ests-ec2/src/commands/GreetingWithErrorsCommand.ts	95.45% <ø> (ø)
...s-ec2/src/commands/HostWithPathOperationCommand.ts	81.81% <ø> (ø)
...-ec2/src/commands/IgnoresWrappingXmlNameCommand.ts	95.45% <ø> (ø)
...ltests-ec2/src/commands/NestedStructuresCommand.ts	86.36% <ø> (ø)
...ltests-ec2/src/commands/NoInputAndOutputCommand.ts	95.45% <ø> (ø)
...c/commands/QueryIdempotencyTokenAutoFillCommand.ts	86.36% <ø> (ø)
... and 221 more

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[github-actions]

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