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PARQUET-2209: [parquet-cpp]  Optimize skip for the case that number of values to skip equals page size (#14545)

In the current code, we will read this page because we are using > and not >= in the branch that decides to skip the rest of the page.

Also includes minor refactoring to reuse the function available_values_current_page(), and use ConsumeBufferedValues() accordingly.

Benchmark results for when batch size = 100K and  number of values per page = 100K.
```
BEFORE
-------------------------------------------------------------------------------
Benchmark       Time             CPU         Iterations
-------------------------------------------------------------------------------
REQUIRED      96831 ns        96326 ns         1000
OPTIONAL     623897 ns       621734 ns         1000
REPEATED    1006153 ns       997482 ns         1000

AFTER
-------------------------------------------------------------------------------
Benchmark      Time             CPU          Iterations
-------------------------------------------------------------------------------
REQUIRED       2175 ns         2164 ns         1000
OPTIONAL       2743 ns         2719 ns         1000
REPEATED       2368 ns         2424 ns         1000
```

Lead-authored-by: Fatemah Panahi <panahi@google.com>
Co-authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>