fix: resolve Cargo.lock, reqwest, and workspace configuration issues

[antonpiat]

BCOS Checklist (Required For Non-Doc PRs)

• Add a tier label: BCOS-L1 or BCOS-L2 (also accepted: bcos:l1, bcos:l2)
• If adding new code files, include SPDX header near the top (example: # SPDX-License-Identifier: MIT)
• Provide test evidence (commands + output or screenshots)

What Changed

• Fixed duplicate thiserror package entry in cross-chain-airdrop/Cargo.lock.
• Updated reqwest feature from rustls-tls to rustls for crates using reqwest v0.13.
• Fixed Cargo workspace configuration issues that prevented Cargo metadata from loading.
• Corrected missing workspace references and manifest configuration issues where applicable.

Testing / Evidence

-Commands executed:

cargo metadata --all-features
cargo build

Verified that the affected crates/workspace load successfully after the fixes.