PricingTable gets Popular badge; SAML config adds metadata URL mode

Minor Changes

• Add highlightedPlan prop to PricingTable default layout to render a "Popular" badge on the matching plan (#8554) by @alexcarpenter

Patch Changes

• Add a two-mode segmented control to the SAML config submission sub-step in <__experimental_ConfigureSSO />. Users pick between Add via metadata URL (default) and Configure manually. The metadata URL form is unchanged; the manual entry form ships in a follow-up commit. Locale keys added under configureSSO.configureStep.samlOkta.modes in en-US. (#8553) by @iagodahlem

• Add confirmation step for <__experimental_ConfigureSSO /> (#8531) by @LauraBeatris

• Add test step for <__experimental_ConfigureSSO /> (#8544) by @LauraBeatris