azuremonitorexporter flushes on each first Span

[an-mmx]

Component(s)

exporter/azuremonitor

What happened?

Description

AzureMonitorExporter calls Flush on each Span.
It is caused by this commit. It seems that Flush must be called after all Spans collected into batches, outside the Resourse/ Scope/ Spans loop.

Steps to Reproduce

To have constant Spans flow into OTEL Collector with AzureMonitorExporter enabled.

Expected Result

AzureMonitorExporter collects Spans in batches and calls Flush.

Actual Result

AzureMonitorExporter calls Flush on each Span.

Collector version

v0.116.0

[github-actions]

Pinging code owners:

• exporter/azuremonitor: @pcwiese

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