Bugfix/CSTACKEX-254: Change the minimum storagepool size to 20MB and throw an exception in case of invalid capacity bytes instead of adjusting to minimum requirement

[sandeeplocharla]

Description

This PR corrects the minimum allowed storage pool size from 1.56GB to 20MB as per ONTAP guidelines for FlexVol. Also, this removes the behaviour to silently correct the invalid capacity bytes to min. requirement, instead it'll throw an exception to let the user decide on the corrective action.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

Case-1: Storage Pool Capacity Bytes = 214B, less than the min. req of 20MB

Case-2: Storage Pool Capacity Bytes = 20971520B or 20MB

[github-actions]

🔴 Test Coverage Grade: D — Marginal

Metric	Value
Line coverage	24.59%
Branch coverage	18.76%

Grade Scale

Grade	Line Coverage	Meaning
🟢 A	≥ 80%	Excellent - this code sleeps well at night 😴
🟡 B	60-79%	Good - almost there, don't stop now 😉
🟠 C	40-59%	Acceptable - your code is wearing a seatbelt, but no airbags 😬
🔴 D	20-39%	Marginal - boldly shipping where no test has gone before 🖖
⛔ F	< 20%	Failing - tests? what tests? 🔥

Branch coverage is shown as a secondary signal. Grade is determined by line coverage.
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