remove prefech dayjs locales

[gibkigonzo]

Related issues

closes #3498

Short description and why it's useful

Added function that creates regexp with needed dayjs locales

QA

1. open http://next.storefrontcloud.io, clear cache and refresh page
2. open Elements tab in devtools and expand head tag. There should be loaded a lot of dayjs...js files
3. checkout on current branch, prepare env (yarn build and yarn start)
4. make 1 and 2 step on current branch page
5. In head should be loaded only needed dayjs...js files based on config.
6. Previous steps could be tested with different config:

• without specified defaultLocale in config.i18n.defaultLocale (should load only en file, because it's fallback language)
• without multistore config (should load en and one specified in config.i18n.defaultLocale)
• with multistore config (should load en and all specified in storeView i18n.defaultLocale)

Which environment this relates to

Check your case. In case of any doubts please read about Release Cycle

• Test version (https://test.storefrontcloud.io) - this is a new feature or improvement for Vue Storefront. I've created branch from develop branch and want to merge it back to develop
• RC version (https://next.storefrontcloud.io) - this is a stabilisation fix for Release Candidate of Vue Storefront. I've created branch from release branch and want to merge it back to release
• Stable version (https://demo.storefrontcloud.io) - this is an important fix for current stable version. I've created branch from hotfix or master branch and want to merge it back to hotfix

Upgrade Notes and Changelog

• No upgrade steps required (100% backward compatibility and no breaking changes)
• I've updated the Upgrade notes and Changelog on how to port existing VS sites with this new feature

IMPORTANT NOTICE - Remember to update CHANGELOG.md with description of your change

Contribution and currently important rules acceptance

• I read and followed contribution rules

[andrzejewsky]

@gibkigonzo looks quite good 👍 can you please add some test scenario for the QA team?

[gibkigonzo]

@andrzejewsky sure :) just added