SNMP: improve Cisco ASAv memory coverage in cisco-firepower-asa profile

[ian28223]

What does this PR do?

Replace two hardcoded scalar OIDs in the cisco-firepower-asa SNMP profile that only collected memory metrics for a single pool (index 1.1) with a full table walk of cempMemPoolTable. Each pool is now tagged by name via cempMemPoolName (mem_pool_name tag).

Motivation

The previous implementation targeted cempMemPoolHCUsed.1.1 and cempMemPoolHCFree.1.1 — hardcoded scalar OIDs pointing to a single row in the CISCO-ENHANCED-MEMPOOL-MIB table. Devices with multiple memory pools (system, reserve, etc.) were silently missing data for all but the first pool. This is tracked in FRNDM-416 / AGENT-16419.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[datadog-prod-us1-6]

 

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 93.93% (+5.90%)

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[dd-octo-sts]

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