NO-SNOW: Send telemetry when closing connection

[sfc-gh-turbaszek]

The following code currently won't emit any telemetry:

conn = connect(connection_name="py")
r = conn.execute_string("select 2;")
print(r[0].fetchall())

on the other hand the following code works (sends telemetry)

with connect(connection_name="py") as conn:
    r = conn.execute_string("select 2;")
    print(r[0].fetchall())

The difference is that context manager handles connection closing differently than handler registered atexit. The handler was configured to basically not send telemetry, causing potential loss of observability.

However, the handler is already doing additional REST calls (in majority of cases):

snowflake-connector-python/src/snowflake/connector/connection.py

Line 1166 in 9c9be36

self.rest.delete_session(retry=retry)

which under the hood does:

snowflake-connector-python/src/snowflake/connector/network.py

Lines 660 to 667 in 9c9be36

	ret = self._post_request(
	url,
	headers,
	json.dumps(body, cls=SnowflakeRestfulJsonEncoder),
	token=self.token,
	timeout=5,
	no_retry=True,
	)

This PR proposes to adopt similar approach (send but not retry) in telemetry close handler.

[sfc-gh-fpawlowski]

lgtm