Enable retry flag for vcs import.

[leander-dsouza]

Note

#27 needs to be merged prior to the review of this PR.

Basic Info

Info	Please fill out this column
Ticket(s) this addresses	#198 #265
Primary OS tested on	Ubuntu
Is this a breaking change?	No
Does this PR contain AI generated software?	No

---

Description of contribution in a few bullet points

• This is a direct port of #265.

• There are two commands in vcs that have the ability to retry - validate and import.
  Both of these functions run ls-remote; however, only validate has the self.run_command() function enabled with the retry flag.

  This is missing from the import command as seen here.

Description of how this change was tested

• Run the export command at the root of the repository on the main branch:

  vcs export . > repos.yaml

  repositories:
    vcs2l:
      type: git
      url: [email protected]:ros-infrastructure/vcs2l.git
      version: leander-dsouza/enable-import-retry

• Next, disable your local connection, and run the import command to view the retry logs:

  mkdir temp && cd temp
  vcs import --input ../repos.yaml .
  
  Retrying command (1/2): /usr/bin/git ls-remote [email protected]:ros-infrastructure/vcs2l.git leander-dsouza/enable-import-retry
  Retrying command (2/2): /usr/bin/git ls-remote [email protected]:ros-infrastructure/vcs2l.git leander-dsouza/enable-import-retry
  
  === ./vcs2l (git) ===
  Could not determine ref type of version: ssh: Could not resolve hostname github.com: Temporary failure in name    resolution
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.

[claraberendsen]

This sounds reasonable and is a good UX improvement!