feat: @W-20318404 Enable telemetry batching in O11yReporter,

[smuduganti-sf]

I've read the CLA Document and I hereby sign the CLA

What does this PR do?

• Enable automatic batching with 30-second periodic flush interval
• Configure 50KB size threshold for automatic flush
• Add shutdown hook to ensure events are flushed on extension deactivation
• Replace immediate upload() calls with batch queuing
• Update dispose() to use forceFlush() for clean shutdown
• Update test mocks to include forceFlush and enableAutoBatching methods

What issues does this PR fix or reference?

#@W-20318404@

Functionality Before

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Functionality After

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[mshanemc]

closed in favor of #6714