add flask example and region tags

[aabmass]

• add region tags to advanced_trace.py
• add flask e2e example with new region tags

[snippet-bot]

Here is the summary of possible violations 😱

Details

There are 9 possible violations for not having product prefix.

• docs/examples/cloud_trace_exporter/advanced_trace.py:18, tag opentelemetry_trace_import
• docs/examples/cloud_trace_exporter/advanced_trace.py:28, tag opentelemetry_setup_exporter
• docs/examples/cloud_trace_exporter/advanced_trace.py:49, tag opentelemetry_trace_custom_span
• docs/examples/cloud_trace_exporter/advanced_trace.py:62, tag opentelemetry_trace_custom_span_events
• docs/examples/cloud_trace_exporter/advanced_trace.py:71, tag opentelemetry_trace_custom_span_links
• docs/examples/flask_e2e/server.py:16, tag opentelemetry_flask_import
• docs/examples/flask_e2e/server.py:33, tag opentelemetry_flask_setup_propagator
• docs/examples/flask_e2e/server.py:39, tag opentelemetry_flask_setup_exporter
• docs/examples/flask_e2e/server.py:55, tag opentelemetry_flask_instrument

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to add 9 region tags.

• docs/examples/cloud_trace_exporter/advanced_trace.py:18, tag opentelemetry_trace_import
• docs/examples/cloud_trace_exporter/advanced_trace.py:28, tag opentelemetry_setup_exporter
• docs/examples/cloud_trace_exporter/advanced_trace.py:49, tag opentelemetry_trace_custom_span
• docs/examples/cloud_trace_exporter/advanced_trace.py:62, tag opentelemetry_trace_custom_span_events
• docs/examples/cloud_trace_exporter/advanced_trace.py:71, tag opentelemetry_trace_custom_span_links
• docs/examples/flask_e2e/server.py:16, tag opentelemetry_flask_import
• docs/examples/flask_e2e/server.py:33, tag opentelemetry_flask_setup_propagator
• docs/examples/flask_e2e/server.py:39, tag opentelemetry_flask_setup_exporter
• docs/examples/flask_e2e/server.py:55, tag opentelemetry_flask_instrument

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[aabmass]

Built docs for the new flask example from the CircleCI run: https://3200-244484614-gh.circle-artifacts.com/0/docs-html/examples/flask_e2e/README.html

[aabmass]

Here is the summary of possible violations 😱

There are 9 possible violations for not having product prefix.
The end of the violation section. All the stuff below is FYI purposes only.

This is flaky and OK to ignore right now. I verified there is a product prefix