Do not show revoke button if revoke_path is absent

What does this MR do and why?

AccessTokenTableApp component assumed that revoke_path in the access token is always present. However, the property revoke_path is optional.

When the revoke_path is absent or falsy, it doesn't display the revoke button action.

Screenshots or screen recordings

Before

After

How to set up and validate locally

1. Create a personal access token:
2. See the revoke button is present
3. Apply patch:

diff --git a/app/assets/javascripts/access_tokens/index.js b/app/assets/javascripts/access_tokens/index.js
index f0c1b415157..c12b45bf2b1 100644
--- a/app/assets/javascripts/access_tokens/index.js
+++ b/app/assets/javascripts/access_tokens/index.js
@@ -43,7 +43,7 @@ export const initAccessTokenTableApp = () => {
     provide: {
       accessTokenType,
       accessTokenTypePlural,
-      initialActiveAccessTokens,
+      initialActiveAccessTokens: initialActiveAccessTokens.map(({ revokePath, ...rest }) => rest),
       noActiveTokensMessage,
       showRole,
     },

1. Reload the page and observe that the button is not present.

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