Add v2r mapping for Switch Packet Integrity Drop counter

[vmittal-msft]

Porting Suvarna's PR - #376

Why I did it

Add v2r mapping to get SAI_SWITCH_STAT_PACKET_INTEGRITY_DROP counters for Chassis platform.

How I did it

Read COUNTERS_DEBUG_NAME_SWITCH_STAT_MAP to get OID and map to Counters so that telemetry can use "COUNTERS/SWITCH*" or "COUNTERS/SWITCH_ID" or "COUNTERS/SWITCH_ID-asic0" to get packet integrity drop counters.

How to verify it

Add unit-test:

    --- PASS: TestGnmiGet/get_COUNTERS:SWITCH_ID (0.00s)
    --- PASS: TestGnmiGet/get_COUNTERS:SWITCH_ID* (0.00s)
    --- PASS: TestGnmiGet/Invalid_fabric_port_key_getSWITCH_ID- (0.00s)
    --- PASS: TestGnmiGetMultiNs/get_COUNTERS:SWITCH_ID-asic0 (0.00s)
    --- PASS: TestGnmiGetMultiNs/get_COUNTERS:SWITCH_ID* (0.00s)
    --- PASS: TestGnmiGetMultiNs/Invalid_fabric_port_key_getSWITCH_ID (0.00s)

Verify on Chassis:

gnmi_get -target_addr localhost:50051 -xpath "COUNTERS/SWITCH*"  -xpath_target COUNTERS_DB -insecure 
COUNTERS/SWITCH*: [{"SWITCH_ID-asic0": {'SAI_SWITCH_STAT_PACKET_INTEGRITY_DROP': '0'}, {"SWITCH_ID-asic1": {'SAI_SWITCH_STAT_PACKET_INTEGRITY_DROP': '0'}} 

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

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111

Description for the changelog

Link to config_db schema for YANG module changes

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

[mssonicbld]

/azp run

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[Copilot]

Pull Request Overview

This PR adds support for the v2r mapping of the Switch Packet Integrity Drop counter by introducing new mapping files, updating the virtual DB translation functions, and extending unit tests.

• Adds mapping files that relate a switch identifier to its packet integrity drop OID.
• Updates the virtual database client and translation functions to support the new SWITCH* vpath.
• Extends unit tests to cover the new mapping and ensure proper response for both valid and invalid keys.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
testdata/COUNTERS_DEBUG_NAME_SWITCH_STAT_MAP.txt	New mapping file defining a switch-to-OID mapping.
testdata/COUNTERS:oid:0x21000000000000.txt	New mapping file for SAI_SWITCH_STAT_PACKET_INTEGRITY_DROP counter.
testdata/COUNTERS:SWITCH_wildcardasic0.txt	New asic-specific mapping file for switch wildcard queries.
testdata/COUNTERS:SWITCH_wildcard.txt	New mapping file for switch wildcard queries.
testdata/COUNTERS:SWITCH_ID.txt	New mapping file for switch keys with no asic appended.
sonic_data_client/virtual_db.go	Implements the v2r mapping logic for switch packet integrity drop counters.
sonic_data_client/db_client.go	Invokes new initialization for the switch stat mapping in the DB client.
gnmi_server/server_test.go	Extends tests to load and validate the new switch mapping configurations.

[mssonicbld]

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[mssonicbld]

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[vmittal-msft]

@abdosi @zbud-msft please help review

[rlhui]

@vmittal-msft , please resolve conflicts

[mssonicbld]

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