chore: shifting test http region tags to show imports (#3405)

* refactor: shifting region tags to show imports tps could miss

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* refactor: wrapping getFunction import under functions_http_unit_test region tag

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: pattishin

functions/helloworld/helloworldHttp/test/sample.unit.http.test.js

@@ -13,7 +13,10 @@
 // limitations under the License.
 
 // FF testing layer for declarative signatures
+
+// [START functions_http_unit_test]
 const {getFunction} = require('@google-cloud/functions-framework/testing');
+// [END functions_http_unit_test]
 
 describe('functions_helloworld_http', () => {
   // [START functions_http_unit_test]
@@ -41,6 +44,7 @@ describe('functions_helloworld_http', () => {
     assert.strictEqual(mocks.res.send.calledOnceWith('Hello World!'), true);
   });
   // [END functions_http_unit_test]
+
   it('helloHttp: should print a name with query', () => {
     const mocks = getMocks();
     mocks.req.query = {name: 'John'};