Prevent HTTP/WS request when node is bootstraping

[bchamagne]

Description

HTTP endpoints will return a 503 when node is bootstraping
WS endpoints will fail when node is bootstraping

Fixes #767

Type of change

• Feature

How Has This Been Tested?

Added test to the suite
Manually tested on explorer for HTTP
Manually tested with a tool for WS

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[apoorv-2204]

lib/archethic_web/controllers/up_controler.ex
nice to have this to up_controller.ex