Disable XLS to XLXS conversion, as fixed upstream

[siddharth-krishna]

EECA-NZ/TIMES-NZ-Model-Files#64

[github-actions]

Regression test results on commit c20a4d2

         Benchmark    Time (s)                 GDX Diff     Accuracy       Correct    Additional
------------------  ----------  -----------------------  -----------  ------------  ------------
     DemoS_001-all   2.1   2.3            OK         OK  100.0 100.0    118    118      3      3
     DemoS_002-all   2.5   3.1            OK         OK  100.0 100.0    344    344      3      3
     DemoS_003-all   2.9   3.1            OK         OK  100.0 100.0    633    633      6      6
         DemoS_004   3.0   3.6            OK         OK  100.0 100.0    662    662     12     12
        DemoS_004a   3.0   3.4            OK         OK  100.0 100.0    665    665     12     12
DemoS_004a-ie-test   3.1   3.4            OK         OK  100.0 100.0    667    667     12     12
        DemoS_004b   3.0   3.6            OK         OK  100.0 100.0    665    665     12     12
     DemoS_004-all   3.0   3.3            OK         OK  100.0 100.0    667    667     12     12
     DemoS_005-all   3.5   4.7            13         13   99.7  99.7   1160   1160     12     12
     DemoS_006-all   4.2   5.4            13         13   99.7  99.7   1258   1258     12     12
     DemoS_007-all   5.2   6.1            13         13   99.8  99.8   2155   2155     12     12
  DemoS_007-all-1r   4.1   4.5            11         11   99.8  99.8   1179   1179     12     12
     DemoS_008-all   7.2   7.5            13         13   99.9  99.9   5333   5333     18     18
     DemoS_009-all   7.8   8.2            30         32   99.9  99.9   5807   5807     29     29
     DemoS_010-all   7.9   8.0           826        822   88.4  88.4   6139   6139     29     29
     DemoS_011-all   7.9   8.0           858        858   88.0  88.0   6150   6150     29     29
     DemoS_012-all   8.5   8.6           903        901   88.2  88.2   6306   6306     53     53
  DemoS_special-t1   4.2   4.1  Error runn… Error runn…   92.2  92.2   2108   2108     42     42
      TIMES-IE-all  23.6  24.4          3125       3125   97.5  97.5  42461  42461   2826   2826
      TIMES-IE-NoM  21.2  21.5           357        357   99.3  99.3  40529  40529    632    632
      TIMES-IE-MCB  20.9  22.7          1100       1100   97.6  97.6  42068  42068    632    632
      TIMES-NZ-KEA  25.1  25.2          3877       3877   98.5  98.5  76487  76487    341    341
      TIMES-NZ-TUI  17.1  18.2          3887       3887   98.5  98.5  76123  76123    347    347

2025-02-06 02:38:56.346 |     INFO : Total runtime: 202.96s (main: 190.90s)
2025-02-06 02:38:56.347 |     INFO : Change in runtime (negative == faster): +12.06s (+6.3%)
2025-02-06 02:38:56.347 |     INFO : Change in correct rows (higher == better): +0 (+0.0%)
2025-02-06 02:38:56.347 |     INFO : Change in additional rows: +0 (+0.0%)
2025-02-06 02:38:56.347 |  SUCCESS : No regressions. You're awesome!

This comment will be updated when new commits are added to the PR.