fix(storage::netapp::ontap::restapi): convert latencies to milliseconds

[omercier]

Description

Fix #5929

Refs: CTOR-2155

Type of change

• Patch fixing an issue (non-breaking change)
• New functionality (non-breaking change)
• Functionality enhancement or optimization (non-breaking change)
• Breaking change (patch or feature) that might cause side effects breaking part of the Software

Summary by Aikido

Security Issues: 0	Quality Issues: 0	Resolved Issues: 0

⚡ Enhancements

• Updated metric labels to use milliseconds units for latency metrics

🐛 Bugfixes

• Converted latency outputs to milliseconds and formatted with two decimals

🔧 Refactors

• Adapted and reformatted robot tests; added latency formatting test cases

📚 Documentation

• Updated file header copyright year to 2026-Present for files

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