Resolve unexpected errors when statuses other than 'running' or 'idle' is received

[ian28223]

What does this PR do?

Resolves following errors:

Unexpected error running `query_connection_overview`: 'receiving'
Unexpected error running `query_connection_overview`: 'sending'

Motivation

AGENT-6213

Additional Notes

traceback added to the code for troubleshooting. Original error did not mention KeyError

Traceback (most recent call last):

File "/opt/datadog-agent/embedded/lib/python3.8/site-packages/datadog_checks/sap_hana/sap_hana.py", line 95, in check
   query_method()
File "/opt/datadog-agent/embedded/lib/python3.8/site-packages/datadog_checks/sap_hana/sap_hana.py", line 191, in query_connection_overview

db_counts[(conn['db_name'], conn['host'], conn['port'])][conn['status'].lower()] += conn['total']

KeyError: 'receiving'

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[codecov]

Codecov Report

Merging #9428 (c31afae) into master (2fc7c56) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Flag	Coverage Δ
sap_hana	93.09% <100.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sap_hana/tests/metrics.py	100.00% <ø> (ø)
sap_hana/datadog_checks/sap_hana/sap_hana.py	88.60% <100.00%> (+0.13%)	⬆️
sap_hana/tests/test_unit.py	100.00% <100.00%> (ø)