Update fuzzing test to check for simpleguest in same directory as executable

[marosset]

Some fuzzing scenarios we want to report require building a fuzzing binary with cargo fuzz build and submitting that binary to a fuzzing harness. In those instances we also want to submit a guestbinary and this PR makes sure that the guestbinary can be found in the same directory as the fuzzing binary.

[Copilot]

PR Overview

This PR enhances the fuzzing test by updating the mechanism for locating the simple guest binary. Key changes include:

• Introducing simple_guest_for_fuzzing_as_string to try locating the guest binary in the same directory as the executable.
• Falling back to the existing simple_guest_as_string method if the binary isn’t found.
• Updating the fuzz target to use the new function.

Reviewed Changes

File	Description
src/hyperlight_testing/src/lib.rs	Added simple_guest_for_fuzzing_as_string using env::current_exe to locate the guest binary at runtime.
src/hyperlight_host/fuzz/fuzz_targets/fuzz_target_1.rs	Updated fuzz target to obtain the guest binary via simple_guest_for_fuzzing_as_string.

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

src/hyperlight_testing/src/lib.rs:2

• The function call to 'rust_guest_as_pathbuf' in simple_guest_as_string is inconsistent with the earlier defined 'c_guest_as_pathbuf'. Please confirm if this discrepancy is intentional or update for naming consistency.

    let buf = rust_guest_as_pathbuf("simpleguest");

[Copilot]

PR Overview

This PR updates the fuzzing tests to ensure that the guest binary (simpleguest) is located in the same directory as the fuzzing executable, and it adjusts various configuration files to align with the new naming conventions. Key changes include:

• Adding a new function in lib.rs to prefer a local guest binary during fuzzing.
• Updating references across fuzz targets to use the new function and binary names.
• Modifying workflow and Cargo.toml configurations to reflect updated target names.

Reviewed Changes

File	Description
src/hyperlight_testing/src/lib.rs	Introduced simple_guest_for_fuzzing_as_string to locate the guest binary
.github/workflows/ValidatePullRequest.yml	Updated target names for fuzzing
.github/workflows/Fuzzing.yml	Updated target names for fuzzing
fuzz/fuzz_targets/*.rs	Replaced usage of simple_guest_as_string with new function usage
fuzz/Cargo.toml	Renamed binaries to include fuzz_ prefix
fuzz/README.md	Updated command examples to reflect new binary names

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

src/hyperlight_testing/src/lib.rs:149

• [nitpick] The error message 'Invalid path string' could be more descriptive by including contextual information about the path conversion failure.

.ok_or(anyhow("Invalid path string"))?