[Cisco][G200/G202x] MoD related fixes for Tajo

[itskittycisco]

Pre-submission checklist

• I've ran the linters locally and fixed lint errors related to the files I modified in this PR. You can install the linters by running pip install -r requirements-dev.txt && pre-commit install
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Summary

1. On Tajo, `SAI_TAM_TRANSPORT_ATTR_SRC_MAC_ADDRESS` and `DST_MAC_ADDRESS` are unsupported (`optionalExtensionAttributeId() == nullopt`), but code attempted to instantiate extension attributes unconditionally, causing a hard check failure id.has_value() Fix is to build `SrcMacAddress` and `DstMacAddress` as optional extension attributes.
2. SDK requires `SAI_TAM_EVENT_ATTR_THRESHOLD` for `SAI_TAM_EVENT_TYPE_PACKET_DROP`. If not set, we get - `Failed to create sai entity TamEvent...: MANDATORY ATTRIBUTE MISSING`. Fix is to always create a SaiTamEventThreshold object for the packet-drop event path. 
3. Tajo tear down fixes. For `TAJO_SAI_SDK` teardown path, clear TAM bindings using empty lists: `switchManager_->setTamObject({})`, `portManager_->setTamObject(portId, {})`instead of reset helpers that set `SAI_NULL_OBJECT_ID` list entries.
4. Tear down ordering fix to avoid "OBJECT IN USE" error 
Before `tamManager_.reset()` in Tajo path, 1. clear switch TAM object list
2. clear TAM object list on all MoD egress ports returned by `getAllMirrorOnDropPortIds()`then reset TAM manager.

Test Plan

Executed the following MoD tests to ensure that the setup and teardown is successful:
• AgentMirrorOnDropStatelessTest.DefaultRouteDrop
• AgentMirrorOnDropStatelessTest.AclDrop
• AgentMirrorOnDropStatelessTest.MmuDrop
• AgentMirrorOnDropStatelessWarmbootTest.WarmbootEnableSampling
• AgentMirrorOnDropStatelessWarmbootTest.WarmbootDisableSampling

[meta-codesync]

@sayeedt has imported this pull request. If you are a Meta employee, you can view this in D105705587.