RFR: 2042: Allow bulk requests with /approval request command [v2]

[Zhao Song]

> As some users requested, we will allow bulk requests with `/approval` request command.
> 
> If an id is not specified in the `/approval` command, the bot will generate a maintainer approval request for all associated bugs.
> 
> This also applies to the `/approval cancel` command, which will cancel the maintainer approval request for all associated bugs.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  Update bots/pr/src/main/java/org/openjdk/skara/bots/pr/ApprovalCommand.java
  
  Co-authored-by: Erik Joelsson <37597443+erikj79 at users.noreply.github.com>

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1565/files
  - new: https://git.openjdk.org/skara/pull/1565/files/6c63bd02..29ad3fee

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1565&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1565&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1565.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1565/head:pull/1565

PR: https://git.openjdk.org/skara/pull/1565