fix: consistent handle of unresolved imports

[grandizzy]

ref foundry-rs/foundry#11149

• handle import error for non existent files in same way as resolve_import_and_include_paths - trace and leave solc to bail

Forge build output changes from

[⠃] Compiling...2025-07-31T06:24:58.330480Z ERROR foundry_compilers_artifacts_solc::sources: error="/badpath/B.sol": No such file or directory (os error 2)
[⠊] Compiling...
Error: failed to resolve file: "/badpath/B.sol": No such file or directory (os error 2); check configured remappings
	--> /tmp/foundry-issue/src/Counter.sol
	/badpath/B.sol

to (on missing file)

[⠃] Compiling...2025-07-31T06:24:55.678474Z ERROR foundry_compilers_artifacts_solc::sources: error="/badpath/B.sol": No such file or directory (os error 2)
[⠊] Compiling...
[⠒] Unable to resolve imports:
      "/badpath/B.sol" in "/tmp/foundry-issue/src/Counter.sol"
with remappings:
      forge-std/=/tmp/foundry-issue/lib/forge-std/src/
[⠢] Compiling 1 files with Solc 0.8.30
[⠆] Solc 0.8.30 finished in 3.51ms
Error: Compiler run failed:
Error (6275): Source "/badpath/B.sol" not found: File not found. Searched the following locations: "/tmp/foundry-issue".
ParserError: Source "/badpath/B.sol" not found: File not found. Searched the following locations: "/tmp/foundry-issue".
 --> src/Counter.sol:4:1:
  |
4 | import {B} from "/badpath/B.sol";

similar with unresolved import

[⠊] Compiling...
[⠒] Unable to resolve imports:
      "badpath/B.sol" in "/tmp/foundry-issue/src/Counter.sol"
with remappings:
      forge-std/=/tmp/foundry-issue/lib/forge-std/src/
[⠢] Compiling 1 files with Solc 0.8.30
[⠆] Solc 0.8.30 finished in 3.67ms
Error: Compiler run failed:
Error (6275): Source "badpath/B.sol" not found: File not found. Searched the following locations: "/tmp/foundry-issue".
ParserError: Source "badpath/B.sol" not found: File not found. Searched the following locations: "/tmp/foundry-issue".
 --> src/Counter.sol:4:1:
  |
4 | import {B} from "badpath/B.sol";
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[mmsaki]

@grandizzy Thanks for fixing this!