65941: roachprod: added capability to set OS disk size for AWS, GCP r=rail a=fabiog1901

Added capability in `roachprod` to set the OS/root disk volume size in GB for AWS and GCP.

The global flag is `--os-volume-size`. 

At times you might want to install additional software, or run some simple tests that do not require additional disks.

Usage example:

```
bin/roachprod create fabio-test -n=1 -c aws|gce --os-volume-size=100
```


66036: ui: Adding TransactionsPageConnected for Cluster UI 21.2 r=nathanstilwell a=nathanstilwell

Added a transactionsPageConnected to cluster-ui for use in the published
package. Also added the associated reducer, sagas, and selectors to
support the connection with a Redux store.

I made a slight adjustment with the prop types of transactionsPage for
clarity and to align with other page components.

Release note: None

66153: roachtest: update sqlalchemy roachtest to use SQLA 1.4 r=rafiss a=arulajmani

This was failing because we reorganized the project and bumped the
SQL Alchemy supported version to 1.4.17.

Fixes #66075

Release note: None

66192: sql: enhance readability of builder tests in new schema changer r=ajwerner a=fqazi

Previously, the new schema changer builder tests had readability
issues trying to figure out the elements getting made. This was
inadequate because the builder tests results were hard to read.
To address this, this patch changes the format for the builder
tests to be easier to read.

Release note: None

Co-authored-by: Fabio Ghirardello <[email protected]>
Co-authored-by: Rail Aliiev <[email protected]>
Co-authored-by: Nathan Stilwell <[email protected]>
Co-authored-by: arulajmani <[email protected]>
Co-authored-by: Faizan Qazi <[email protected]>