Avoid enabling flex-error/eyre_tracer feature

[mina86]

Don’t enable flex-error/eyre_tracer feature in crates which don’t use eyre directly. This allows customers depend on say tendermint crate without having to pull in eyre crate. This is useful because eyre uses mutable static variables (specifically HOOK variable) which is incompatible with some blockchain runtimes.

• [n/a] Referenced an issue explaining the need for the change
• [x] Updated all relevant documentation in docs
• [x] Updated all code comments where relevant
• [n/a] Wrote tests
• [x] Added entry in .changelog/

[mina86]

@romac

[romac]

Good catch! Thanks