Bazel 8 support

Bazel 8 introduced some incompatible changes. For example: [Incompatible] The format of canonical repo names has changed to use plus (+) instead of tilde (~)(taken from the 8.0.0 bazel release)

We need to add support for builds using Bazel 8+ by addressing any incompatible changes:

• --incompatible_use_plus_in_repo_names, a flag which changes the tilde (~) character used in canonical repo names to the plus (+) sign, defaults true and is now a no-op (cannot be changed). Since we are using bazel 7.4.0+ (also 8.0.0) support for both separators is required.

In addition Bazel 8 should be added to the list of versions we run against our CI.