Cloudwatch: v12.2.0 or above - Can't execute "Run queries" with default cloudwatch options selected in UI.

### What happened? Create new dashboard visualisation with cloudwatch datasource, 1. Select Namespace & "Metric name", leave the statistic as default "Average". 2. Click on "Run queries" and see that nothing happens, no request is sent out to pull the metrics from cloudwatch. 3. Expected to run the query and fetch the metrics in step 2. 4. Now, toggle the statistic to "Minimum" and then back to "Average". And click on "Run queries". The query is executed and metrics is displayed. 5. Also, notice that "Match exact" isn't set to false in the request, as it seems default with 12.2.0. This is affecting the results as well. <img width="1579" height="678" alt="Image" src="https://github.com/user-attachments/assets/c5b3bf7c-23f0-4146-9e3f-3d72c0ecd2d6" /> After flipping the Statistic to "Minimum" and then to "Average", the "Run queries" is enabled and request fired, <img width="1780" height="934" alt="Image" src="https://github.com/user-attachments/assets/e2bcf8d8-84ac-4800-b435-68c1cd5092d1" /> After again flipping "Match exact" to ON & OFF, you can see it is set to false in json request, <img width="1809" height="919" alt="Image" src="https://github.com/user-attachments/assets/883361bb-3a2c-446c-a93d-bc2191b0b38a" /> ### What did you expect to happen? After following selections, the "Run queries" should be enabled and request sent for metrics should have "Match exact" set to false, as below, Create new dashboard visualisation with cloudwatch datasource, 1. Select Namespace & "Metric name", leave the statistic as default "Average". <img width="1809" height="919" alt="Image" src="https://github.com/user-attachments/assets/83f972a8-d04a-4dc8-bbf1-51c210abc622" /> ### Did this work before? Yes, in 12.1.1, but the UI is bit changed in 12.2.0 ### How do we reproduce it? 1. Run version 12.2.0 or higher version of Grafana 2. Create cloudwatch datasource 3. Select Namespace & "Metric name", leave the statistic as default "Average". 4. Try executing the "Run queries". ### Is the…