Modify optics_power_and_bias_current_test to address coverage gaps

[ram-mac]

Modify optics_power_and_bias_current_test.go with below changes
-Sampling rate increased to 10s, monitoring window extended to 3 minutes, and checks added to verify telemetry stability (no -40 dBm/0 mA dips) when the interface is UP

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the optics power and bias current test suite to improve detection of intermittent telemetry issues. By extending the monitoring duration and increasing the sampling frequency, the test now provides more robust validation of telemetry stability during steady-state operations.

Highlights

• Test Coverage Enhancement: Added documentation for bug coverage related to intermittent telemetry dips on Cisco platforms.
• Monitoring Parameters: Updated the test to use a 10-second sampling interval over a 3-minute monitoring window to better detect telemetry instability.
• Stability Assertions: Implemented new checks to ensure that optics power does not drop to -40 dBm and laser bias current remains above 0 when the interface is UP.

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[OpenConfigBot]

Pull Request Functional Test Report for #5668 / 7ce01ad

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info	50e5e19b	Log
Cisco 8000E		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info	d640aaa0	Log
Cisco XRd		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info	5f6515c1	Log
Juniper ncPTX		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info	66354f4b	Log
Nokia SR Linux		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info	f0a8e8a9	Log
Openconfig Lemming		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info	2aa4d74e	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info
Cisco 8808		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info
Juniper PTX10008		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info
Nokia 7250 IXR-10e		gNMI-1.13: Optics Telemetry, Instant, threshold, and miscellaneous static info

Help

[gemini-code-assist]

Code Review

This pull request updates the README.md for the optics power and bias current test to document bug coverage for intermittent telemetry dips on Cisco platforms (b/433734226). The review feedback recommends replacing an internal Google short link with the public-facing Google Issue Tracker URL format to ensure accessibility for external contributors.