Standardize jump links

[anselmbradford]

Brings in design-system jump link updates from:

cfpb/design-system#1987
cfpb/design-system#1988
cfpb/design-system#1989
cfpb/design-system#1990
cfpb/design-system#1991

Changes

• Deprecate m-list__link to a-link a-link--jump.
• Fix issue where jump links in a stack would not highlight the top border on hover.

How to test this PR

1. Example pages are below. The majority should have jump links (search for a-link--jump in the source).

KBYO
http://localhost:8000/know-before-you-owe/
http://localhost:8000/know-before-you-owe/compare/
http://localhost:8000/know-before-you-owe/timeline/

Careers - should not have a broken subtext
http://localhost:8000/about-us/careers/
http://localhost:8000/about-us/careers/supervisory-investigator-24-cfpb-139-p24-cfpb-138-mp/
http://localhost:8000/about-us/careers/application-process/

Financial Well-being
http://localhost:8000/consumer-tools/financial-well-being/
http://localhost:8000/consumer-tools/financial-well-being/about/
http://localhost:8000/consumer-tools/financial-well-being/results/

Ask CFPB
http://localhost:8000/ask-cfpb/
http://localhost:8000/ask-cfpb/do-buy-now-pay-later-bnpl-loans-have-fees-en-2118/

D&I
http://localhost:8000/about-us/diversity-and-inclusion/voluntary-assessment-onboarding-form/
http://localhost:8000/about-us/diversity-and-inclusion/voluntary-assessment-onboarding-form/privacy-act-statement/

TDP
http://localhost:8000/consumer-tools/educator-tools/youth-financial-education/teach/activities/bouncing-ball-money-choices/

Retirement
http://localhost:8000/es/herramientas-del-consumidor/jubilacion/antes-de-solicitar/

OAH/BAH Rate Explorer
http://localhost:8000/owning-a-home/explore-rates/

FAHC
http://localhost:8000/find-a-housing-counselor/

ROUT
http://localhost:8000/rural-or-underserved-tool/

iRegs
http://localhost:8000/rules-policy/regulations/1002/2023-04-19/interp-1/

FIG
http://localhost:8000/data-research/small-business-lending/filing-instructions-guide/2024-guide/

Credit Card agreements database related links - sidebar related links should NOT be jump link at mobile
http://localhost:8000/credit-cards/agreements/issuer/1st-advantage-federal-credit-union/

Info Unit Groups
http://localhost:8000/about-us/

Featured Content
http://localhost:8000/consumer-tools/credit-reports-and-scores/consumer-reporting-companies/

Notification
http://localhost:8000/arbitration-rule/

Text Introduction
http://localhost:8000/administrative-adjudication-proceedings/administrative-adjudication-docket/

Homepage - footer links should be unchanged.
http://localhost:8000/

Notes and todos

The new behavior of jump links vertically centers the external link icon after the text, so if the link is very long, it'll end up on the right-hand side. We should probably encourage shorter links if that's an issue. I think it improves cases like this though:

Before:

After:

[anselmbradford]

@contolini is this change for FIG sticky nav OK?