Make superseding campaign spec dismissible

Created by: eseliger

..and adjust wording.

Created by: sourcegraph-bot

Notifying subscribers in CODENOTIFY files for diff 435982d0fc8b73dad429fe9dd6eecb91c034d50e...96765890aaeef88ec347d1dd17ea0ef3fd22e17a.

Notify	File(s)
@LawnGnome	client/web/src/enterprise/campaigns/detail/SupersedingCampaignSpecAlert.story.tsx client/web/src/enterprise/campaigns/detail/SupersedingCampaignSpecAlert.tsx

Created by: codecov[bot]

Codecov Report

Merging #17657 (9676589) into main (3de638b) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main   #17657   +/-   ##
=======================================
  Coverage   51.58%   51.58%           
=======================================
  Files        1717     1717           
  Lines       85277    85277           
  Branches     7764     7821   +57     
=======================================
+ Hits        43987    43992    +5     
+ Misses      37417    37411    -6     
- Partials     3873     3874    +1     

Flag	Coverage Δ
go	50.46% <ø> (-0.01%)
integration	30.74% <ø> (+<0.01%)
storybook	30.64% <ø> (+0.04%)
typescript	54.27% <ø> (+0.02%)
unit	34.58% <ø> (ø)

Impacted Files	Coverage Δ
.../campaigns/detail/SupersedingCampaignSpecAlert.tsx	100.00% <ø> (ø)
.../internal/codeintel/resolvers/graphql/locations.go	83.50% <0.00%> (-2.07%)
client/web/src/settings/SettingsFile.tsx	71.73% <0.00%> (+1.08%)
client/shared/src/search/query/providers.ts	62.06% <0.00%> (+20.68%)