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RT-2.15 Fix all issues causing failure in the isis_extensions_segment_routing_test.go (#4775)

* RT-2.15 Add deviation for aggregate SID counter out packets telemetry

Arista: b/449592554
Devices that do not support
/network-instances/network-instance/mpls/signaling-protocols
/segment-routing/aggregate-sid-counters/aggregate-sid-counter/state/out-pkts.

* RT-2.15 Add deviation for ISIS SR no-php requirement

Arista: b/462580165 requires no-php for receiving packet with self advertised label
Devices that require no-php flag for ISIS SR prefix and node segments

* RT-2.15: IS-IS Extensions for Segment Routing Test

This commit implements RT-2.15 test for IS-IS Segment Routing Extensions.

Changes:
- Add test implementation for ISIS SR with node and prefix SIDs
- Configure SR capabilities on DUT and ATE
- Validate SID advertisements and traffic forwarding
- Use deviations for Arista-specific configurations:
  - isis_sr_no_php_required for no-php flag requirement
  - aggregate_sid_counter_out_pkts_unsupported for counter telemetry
  - Enable hardware counters for MPLS LFIB on Arista devices

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