Update product links for AMQ Streams

Red Hat AMQ Streams 2.0 has a new splash page.

https://access.redhat.com/documentation/en-us/red_hat_amq_streams

Check that the following updates have been made on the product pages.

Issue raised with customer portal product experience

https://issues.redhat.com/browse/CPPX-73

Update the product page links to reflect the change.

Products page

• Change the Categories -> Integration and Automation -> Red Hat AMQ Streams -> Product Documentation link from[ https://access.redhat.com/documentation/en-us/red_hat_amq/|https://access.redhat.com/documentation/en-us/red_hat_amq/] to[ https://access.redhat.com/documentation/en-us/red_hat_amq_streams|https://access.redhat.com/documentation/en-us/red_hat_amq_streams/2.0]

Red Hat AMQ page

https://access.redhat.com/products/red-hat-amq/#streams

• Change `Streams 1.8` to `Streams 2.0`
• Change the AMQ Streams Documentation link from[ https://access.redhat.com/documentation/en-us/red_hat_amq/2021.q4|https://access.redhat.com/documentation/en-us/red_hat_amq/2021.q4] to[ https://access.redhat.com/documentation/en-us/red_hat_amq_streams|https://access.redhat.com/documentation/en-us/red_hat_amq_streams/2.0]
• Add a new link to AMQ Streams 2.0 documentation to the Red Hat AMQ 7 list (as it's now separate from AMQ docs)