Various fixes & improvements

• ref: Exclude mobile-app command from release builds (#2582) by @szokeasaurusrex
• feat(login): Improve error output for login errors (#2581) by @szokeasaurusrex
• test(monitors): pass empty options to grep (#2562) by @lcian
• feat(login): Warn when overwriting existing auth token (#2554) by @szokeasaurusrex
• meta: Add .sentryclirc to gitignore (#2547) by @rbro112
• build: Bump MSRV to 1.86