fix(roottest): resolve templateName and strings WILLFAIL in treeformula/parse

[Aaravanand00]

Description

Re-enables TTreeFormula string parsing (strings) and template proxy name generation (templateName) in roottest/root/treeformula/parse after validating grep conversion filters (OUTCNVCMD). Removes WILLFAIL flags.

[github-actions]

Test Results

    23 files      23 suites   3d 8h 55m 41s ⏱️
 3 847 tests  3 844 ✅ 0 💤  3 ❌
72 919 runs  72 895 ✅ 0 💤 24 ❌

For more details on these failures, see this check.

Results for commit 5ce02b3.

♻️ This comment has been updated with latest results.

[Aaravanand00]

Hi @guitargeek

Here is the actual fix for the strings test in roottest/root/treeformula/parse :-

Root Cause

1. Undeclared Identifier in runstrings.C :-
   The declaration and retrieval of t_its was conditionally wrapped inside #ifdef ClingWorkAroundMissingDynamicScope. In modern Cling macro execution, this macro is not defined during interpreted execution, causing t_its to be undeclared (error: use of undeclared identifier 't_its').

2. Reference Output Discrepancy in strings.ref :-
   The reference file had a leading newline and a typo on line 2 (Processing runstring.C... missing the trailing s), whereas ROOT outputs Processing runstrings.C....

3. Scope Clarification :-
   templateName retains its documented WILLFAIL tag (due to platform-dependent compiler output differences noted in the CMake file), ensuring this PR only enables and resolves the strings test.

Solution

• Unconditionally declared and retrieved TTree *t_its via _file0->GetObject("t_its", t_its); in runstrings.C.
• Fixed the macro name typo and removed the superfluous leading newline in strings.ref.
• Removed WILLFAIL and the obsolete comment for strings in CMakeLists.txt.

[Aaravanand00]

@guitargeek ptal why these checks failed....