ts: Fix loading programs with numbers in their names using workspace

[acheroncrypto]

Problem

Using numbers in program identifiers might result in problems when loading the program using anchor.workspace as explained here:

https://github.com/coral-xyz/anchor/blob/6ff6655526dab71c12a32450f1c3897ac970119f/ts/packages/anchor/src/workspace.ts#L27-L42

When I initially was working on the above change, I first made it assume there is no _ involved e.g. if the user gives myProgram2, the program name is my_program2. However, with this change, the examples started failing because their names are basic_<number>, which then made me change it to its current form.

For example, if the program name is program_v2, and it's getting loaded with anchor.workspace.programV2, it results in the following error:

Error: target/idl/program_v_2.json doesn't exist. Did you run `anchor build`?

This is also one of the most commonly reported problems.

Summary of changes

Fix loading programs with numbers in their names using anchor.workspace.

Resolves #3353

[vercel]

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