Tom Donarski issues

Results 3 issues of


                                            Tom Donarski

[SP-120] Infer default country from Store

### **What?** [SP-120](https://upsidelab.atlassian.net/browse/SP-120) Infer default country from Store instead of config. ### **Why?** Spree no longer uses Spree::Config[:default_country_id] - it's now managed at per-store level. [SP-120]: https://upsidelab.atlassian.net/browse/SP-120?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

SP-102 Spike upgrading Bootstrap in the admin panel

### **What?** This PR addresses breaking changes related to [migration to Bootstrap v.5.0.2](https://getbootstrap.com/docs/5.0/migration/) ### **Why?** Maintenance.

SP-107,108,109 Bulk promo codes

### **What?** This PR extends the bulk promo codes feature with administrative functionality through the admin panel. Handling and administrating promotion batches: Create batch: https://github.com/spree/spree/assets/40342677/b5e13064-b976-4efa-ab65-45375459eb4e Populate batch: https://github.com/spree/spree/assets/40342677/1d0a518a-63a1-4791-8782-eab328584d54 Promotion codes...