[FEATURE] Enhance polling mechanism of LRO commands

Use Case / Problem

Related to issue https://github.com/microsoft/fabric-cli/issues/114

Commands like export use polling mechanism to check for command completion, the mechanism is based on returned time from the API call.

For some commands, according to command action and params (for example get definition of small item), the API completion time might be shorter than the CLI command completion time.

Proposed Solution

Consider how to update the polling mechanism to complete the polling of short LRO commands in shorter time than the default time

Alternatives Considered

No response

Impact Assessment

• This would help me personally
• This would help my team/organization
• This would help the broader fabric-cli community
• This aligns with Microsoft Fabric roadmap items

Implementation Attestation

• I understand this feature should maintain backward compatibility with existing commands
• I confirm this feature request does not introduce performance regressions for existing workflows
• I acknowledge that new features must follow fabric-cli's established patterns and conventions

Implementation Notes

No response

Start by reading related issue #114 and tracing the polling used by export commands, including the small-item definition case. Determine how command action and parameters affect completion timing while preserving existing command behavior; done means short-running LRO commands complete sooner without regressions.