ARROW-6524: [Developer][Packaging] Nightly build report's subject should contain Arrow
ARROW-6524: [Developer][Packaging] Nightly build report's subject should contain Arrow

Closes #5347 from kszucs/ARROW-6524 and squashes the following commits:

f456ba33a <Krisztián Szűcs> use Arrow in the body as well
183b9f170 <Krisztián Szűcs> for job
8ae60cd2c <Krisztián Szűcs> update subject

Authored-by: Krisztián Szűcs <6bab32dc957a05a87930e779f272342e159326fa@gmail.com>
Signed-off-by: Krisztián Szűcs <6bab32dc957a05a87930e779f272342e159326fa@gmail.com>

apache/arrow,kou/arrow,apache/arrow,kou/arrow,kou/arrow,wesm/arrow,cpcloud/arrow,cpcloud/arrow,wesm/arrow,icexelloss/arrow,cpcloud/arrow,kou/arrow,cpcloud/arrow,wesm/arrow,apache/arrow,renesugar/arrow,icexelloss/arrow,kou/arrow,cpcloud/arrow,wesm/arrow,wesm/arrow,cpcloud/arrow,wesm/arrow,wesm/arrow,kou/arrow,renesugar/arrow,renesugar/arrow,laurentgo/arrow,icexelloss/arrow,renesugar/arrow,renesugar/arrow,laurentgo/arrow,laurentgo/arrow,apache/arrow,xhochy/arrow,xhochy/arrow,kou/arrow,xhochy/arrow,laurentgo/arrow,renesugar/arrow,renesugar/arrow,xhochy/arrow,laurentgo/arrow,laurentgo/arrow,renesugar/arrow,wesm/arrow,xhochy/arrow,apache/arrow,laurentgo/arrow,wesm/arrow,icexelloss/arrow,cpcloud/arrow,cpcloud/arrow,renesugar/arrow,renesugar/arrow,renesugar/arrow,kou/arrow,renesugar/arrow,kou/arrow,icexelloss/arrow,xhochy/arrow,wesm/arrow,icexelloss/arrow,xhochy/arrow,laurentgo/arrow,wesm/arrow,icexelloss/arrow,laurentgo/arrow,xhochy/arrow,laurentgo/arrow,xhochy/arrow,apache/arrow,xhochy/arrow,laurentgo/arrow,icexelloss/arrow,renesugar/arrow,renesugar/arrow,cpcloud/arrow,wesm/arrow,kou/arrow,kou/arrow,kou/arrow,laurentgo/arrow,icexelloss/arrow,xhochy/arrow,apache/arrow,cpcloud/arrow,apache/arrow,icexelloss/arrow,cpcloud/arrow,apache/arrow,wesm/arrow,apache/arrow,kou/arrow,cpcloud/arrow,icexelloss/arrow,xhochy/arrow,laurentgo/arrow,cpcloud/arrow,renesugar/arrow,icexelloss/arrow,laurentgo/arrow,icexelloss/arrow,xhochy/arrow,kou/arrow,icexelloss/arrow,apache/arrow,apache/arrow,cpcloud/arrow,xhochy/arrow,apache/arrow,apache/arrow,xhochy/arrow,laurentgo/arrow,wesm/arrow