Update SRv6 test conditions for 202412, master, and 202511+ releases

[bpar9]

Description of PR

Summary:
Updates SRv6 test skip conditions in tests_mark_conditions.yaml to:

1. Expand supported releases from only 202412 to include 202412, master, and 202511+ releases
2. Add skip condition for Mellanox SPC1-3 platforms (asic_gen in ['spc1', 'spc2', 'spc3'])

Affected test files:

• srv6/test_srv6_dataplane.py
• srv6/test_srv6_static_config.py
• srv6/test_srv6_vlan_forwarding.py

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• New Test case
  • Skipped for non-supported platforms
• Test case improvement

Back port request

• 202205
• 202305
• 202311
• 202405
• 202411
• 202505
• 202511

Approach

What is the motivation for this PR?

Enable SRv6 tests to run on master and 202511+ releases in addition to 202412, while skipping tests on Mellanox SPC1-3 platforms which do not support SRv6.

How did you do it?

Modified the release condition from release not in ['202412'] to release not in ['202412', 'master'] and not (release.startswith('2025') and int(release[4:]) >= 511) to allow tests on 202412, master, and any 2025xx release where xx >= 511.

Added new skip condition asic_gen in ['spc1', 'spc2', 'spc3'] to skip tests on Mellanox SPC1-3 platforms.

How did you verify/test it?

YAML syntax verified. Changes are configuration-only and will be validated when tests run in CI.

Any platform specific information?

Tests will be skipped on Mellanox SPC1, SPC2, and SPC3 platforms.

Supported testbed topology if it's a new test case?

N/A - existing test configuration update

Documentation

N/A

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Link to Devin run: https://cisco-demo.devinenterprise.com/sessions/1b3ce16abcb140289a93bf2b0923cd61
Requested by: bhavani@cisco.com (@bpar9)

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