Fix Y2038 timestamp overflow in sonic-pac authentication manager

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Why I did it

This PR addresses the Y2038 timestamp overflow problem in the sonic-pac authentication manager. On January 19, 2038, 32-bit signed Unix timestamps will overflow, causing timestamp comparisons and calculations to fail. The affected fields (sessionTime and lastAuthTime) store authentication session timestamps that could be affected by this overflow.

This is part of a coordinated Y2038 fix effort across multiple SONiC submodules (sonic-stp, sonic-sairedis, sonic-pac).

Work item tracking

• Microsoft ADO (number only):

How I did it

Changed timestamp fields from uint32 to uint64 in three header files:

• authmgrClientInfo_t.sessionTime and authmgrClientInfo_t.lastAuthTime in auth_mgr_db.h
• authmgrPortSessionStats_t.sessionTime in auth_mgr_exports.h
• pac_authenticated_clients_oper_table_t.sessionTime and pac_authenticated_clients_oper_table_t.lastAuthTime in pacoper_common.h

Updates since last revision:

• Added Y2038 unit tests in src/sonic-pac/tests/test_y2038_timestamp.c covering:
  • Type size verification (uint64 is 8 bytes)
  • Timestamp storage beyond Y2038 overflow point
  • Arithmetic operations at Y2038 boundary
  • Session duration and timeout calculations
  • Struct field size verification
• Added Y2038 detection signature functions and tests:
  • y2038_overflow_imminent(): Returns true if timestamp is within 1 year of Y2038 overflow
  • y2038_overflow_occurred(): Returns true if timestamp has passed the Y2038 overflow point
  • Y2038_TIMESTAMP_CHECK macro: Compile-time check that timestamp type is at least 64-bit
  • Tests for detection signatures with PAC-specific authmgrClientInfo_t types

How to verify it

1. Verify the code compiles successfully
2. Compile and run the new unit tests: gcc -o test_y2038 src/sonic-pac/tests/test_y2038_timestamp.c && ./test_y2038
3. Verify that all code using these fields handles 64-bit values correctly (especially format specifiers in logging)
4. Check that serialization/deserialization of these structures is updated if applicable

Important review items:

• Verify uint64 typedef is properly defined in datatypes.h
• Check auth_mgr_control.c lines 1722-1730 for overflow handling logic that may need updating (uses 0xffffffff constant)
• Verify format specifiers in auth_mgr_debug.c (lines 1340, 1342) are updated for 64-bit values
• Confirm no binary serialization depends on the old struct sizes
• Verify the new unit tests compile and pass in the full build environment

Which release branch to backport (provide reason below if selected)

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

Tested branch (Please provide the tested image version)

Description for the changelog

Fix Y2038 timestamp overflow in sonic-pac by changing sessionTime and lastAuthTime fields from uint32 to uint64

Link to config_db schema for YANG module changes

N/A - no YANG model changes

A picture of a cute animal (not mandatory but encouraged)

Additional context

• Related PRs: sonic-stp#2, sonic-sairedis#5
• Link to Devin run: https://cisco-demo.devinenterprise.com/sessions/e8daae58b25f43d6a58b0c5647f4b0e4
• Requested by: Arthur Poon (@arthurkkp-cog)

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✅ Devin Review: No Issues Found

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