[tests-only][full-ci] test(cli): add blobstore get and check CLI tests

[anon-pradip]

Description

Adds acceptance tests for the storage-users blobstore check and storage-users blobstore get CLI commands introduced in #12102.

New test scenarios (tests/acceptance/features/cliCommands/blobstore.feature):

Scenario	Assertion
check with default size	full round-trip: upload, download+verify, delete
check with custom size	--blob-size=1KB accepted, round-trip passes
check with invalid size	--blob-size=abc rejected with invalid --blob-size
get without flags	error: either --path or both --blob-id and --space-id must be set
get non-existent blob	error: download failed: could not read blob

Related Issue

• Part of: [QA] Add new automated tests #12472

Motivation and Context

How Has This Been Tested?

• test environment:
• Locally
• CI

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

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[PrajwolAmatya]

Can we also check with valid blob size.

[nabim777]

Suggested change

	When the administrator gets a non-existent blob from the blobstore using the CLI
	When the administrator tries to get a non-existent blob from the blobstore using the CLI

[nabim777]

Suggested change

	* @When the administrator gets a non-existent blob from the blobstore using the CLI
	* @When the administrator tries to get a non-existent blob from the blobstore using the CLI

[nabim777]

The command also supports the flag --path. So, if possible, it would be good to add a test that checks it with a valid path as well.

[nabim777]

I also saw these commands in the README. Is there a plan to add tests for them, or are they being skipped because they cannot be tested?

check  check blobstore connectivity via an upload/download/delete round-trip
get    get a blob from the blobstore by ID

REF: https://github.com/owncloud/ocis/blob/master/services/storage-users/README.md#check-and-inspect-the-blobstore