[BEAM-12852] Revert change to int, use bigint in BigTable test

[apilloud]

This reverts a type change and uses an explicit cast.

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ValidatesRunner compliance status (on master branch)

Lang	ULR	Dataflow	Flink	Samza	Spark	Twister2
Go	---					---
Java
Python	---					---
XLang						---

Examples testing status on various runners

Lang	ULR	Dataflow	Flink	Samza	Spark	Twister2
Go	---	---	---	---	---	---	---
Java	---		---	---	---	---	---
Python	---	---	---	---	---	---	---
XLang	---	---	---	---	---	---	---

Post-Commit SDK/Transform Integration Tests Status (on master branch)

Go	Java	Python

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website	Whitespace	Typescript
Non-portable
Portable	---			---	---	---

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[apilloud]

R: @ibzib

[apilloud]

Looks like I can't do a clean revert here, that actually removes some support for logical types.

[ibzib]

LGTM

[apilloud]

Run Java_Examples_Dataflow PreCommit