chore: add build specific samples project (#55)

* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* chore(python): use BUILD_SPECIFIC_GCLOUD_PROJECT for samples

https://github.com/googleapis/python-talent/blob/ef045e8eb348db36d7a2a611e6f26b11530d273b/samples/snippets/noxfile_config.py#L27-L32

`BUILD_SPECIFIC_GCLOUD_PROJECT` is an alternate project used for sample tests that do poorly with concurrent runs on the same project.

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Wed Sep 30 13:06:03 2020 -0600
Source-Repo: googleapis/synthtool
Source-Sha: 9b0da5204ab90bcc36f8cd4e5689eff1a54cc3e4
Source-Link: googleapis/synthtool@9b0da52

Co-authored-by: Dan O'Meara <danom@google.com>

synth.metadata

@@ -3,8 +3,8 @@
     {
       "git": {
         "name": ".",
-        "remote": "git@github.com:googleapis/python-videointelligence.git",
-        "sha": "463636e3b183a1ab836765fab761161d70f74970"
+        "remote": "https://github.com/googleapis/python-videointelligence.git",
+        "sha": "55415a81e738badc997e93d60c37b5dbc8b373ea"
       }
     },
     {
@@ -19,14 +19,15 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "e89175cf074dccc4babb4eca66ae913696e47a71"
+        "sha": "9b0da5204ab90bcc36f8cd4e5689eff1a54cc3e4"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "e89175cf074dccc4babb4eca66ae913696e47a71"
+        "sha": "9b0da5204ab90bcc36f8cd4e5689eff1a54cc3e4"
+
       }
     }
   ],