### What changes were proposed in this pull request?
As title, introduce metrics_ShuffleFallbackCount_Value.
### Why are the changes needed?
To provide the insights that how many shuffles fallback to spark built-in shuffle service. It is helpful for us to deprecate the ESS progressively.
Currently, we plan to set the `celeborn.client.spark.shuffle.fallback.numPartitionsThreshold` to fallback the shuffle with too large shuffle partitions number, for example: 50k.
In the future, we plan to limit the acceptable maximum shuffle partition number so that the bad job would be rejected and not impact the celeborn master health.
### Does this PR introduce _any_ user-facing change?
Yes, new metrics.
### How was this patch tested?
UT.
<img width="1188" alt="image" src="https://github.com/user-attachments/assets/8193c12c-5dc9-4783-b64b-6a8449a1bea4">
Closes#2866 from turboFei/record_fallback.
Lead-authored-by: Wang, Fei <fwang12@ebay.com>
Co-authored-by: Fei Wang <cn.feiwang@gmail.com>
Signed-off-by: mingji <fengmingxiao.fmx@alibaba-inc.com>
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