Improve PricingTable component items

[dkmyta]

Description # In an attempt to improve upon the fantastic work put in to create and update the new PricingTable component that will be used in the unification of standalone Jetpack product pricing pages, I have identified a number of minor updates that may present difficulties in particular cases and one potential area of improvement.

Updates:

• [x] The new discount label overlaps when price / offPrice values are too significant and/or when a currency symbol has been added

• [x] CSS for the main Gridicon component appears to be overriding the new .popover-icon element styles for the PricingTable component making the icon bold like the preceding text rather than fill: =var(--jp-gray); as intended.

• [x] ~~There is some odd/somewhat random behavior of popover tooltips sticking when hovering over them~~

  • The primary issue is being addressed in #26457

• [x] Popovers can become hidden behind the primary admin sidebar menu.

• [x] ~~The TOS element does not remain centered on the columns and becomes cut off as we change screen sizes before entering the mobile view.~~

  • The primary issue is being addressed in #26509

Improvements:

• [x] We can take advantage of the logic used in the JetpackProductOffer component in Calypso that introduces a discount label and automatically generates the content of the label based on a number of pricing-related variables. This will allow us to bring consistency between the various dashboards that may display a discount badge so there are no discrepancies in the calculations that may lead to unnecessary consumer confusion.

Other information:

• [x] Have you written new tests for your changes, if applicable?
• [x] Have you checked the E2E test CI results, and verified that your changes do not break them?

Jetpack product discussion

• 1201069996155224-as-1202920335836514
• p1HpG7-hMo-p2

Does this pull request change what data or activity we track or use?

• No

Testing instructions:

• Run npm run storybook:dev from the js-packages/storybook folder
• Change the default price, offPrice, and currency values and verify the promo label reacts accordingly
• Ensure the TOS component remains centered to columns 2 and 3 while decreasing viewport width until the mobile view is activated
• Play with the various options and ensure the components handles the changes as expected
• Load this PR using the Jetpack Beta plugin on a Jurassic Ninja site and verify that the icon tooltip popover handles and displays as expected
• Check the Figma file to ensure the design matches

[github-actions[bot]]

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[github-actions[bot]]

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[danielpost]

Can we leave the option to add a promo label to a column that's not an automatically calculated percentage? In our case we're adding New! as a label to a column, so removing that option wouldn't be ideal.