test: set exit code to 0 to get invalid args tests to pass (#316)

Currently the CI on the main branch is red because non-zero exit code has started to be considered as test failure since Deno 1.44.0. 

```
ERRORS 

parseArgsForLogSubcommand ... specify invalid format in since => ./src/subcommands/logs_test.ts:51:11
error: Error: Test case finished with exit code set to 1.
  await t.step("specify invalid format in since", () => {
  ^
    at exitSanitizer (ext:cli/40_test.js:113:15)
    at async Object.outerWrapped [as fn] (ext:cli/40_test.js:134:14)
    at async TestContext.step (ext:cli/40_test.js:492:22)
    at async file:///Users/runner/work/deployctl/deployctl/src/subcommands/logs_test.ts:51:3

parseArgsForLogSubcommand ... specify invalid format in until => ./src/subcommands/logs_test.ts:55:11
error: Error: Test case finished with exit code set to 1.
  await t.step("specify invalid format in until", () => {
  ^
    at exitSanitizer (ext:cli/40_test.js:113:15)
    at async Object.outerWrapped [as fn] (ext:cli/40_test.js:134:14)
    at async TestContext.step (ext:cli/40_test.js:492:22)
    at async file:///Users/runner/work/deployctl/deployctl/src/subcommands/logs_test.ts:55:3

 FAILURES 
```

This commit works around this issue by forcibly setting exit code to 0.

src/subcommands/logs_test.ts

@@ -1,13 +1,33 @@
 import { parseArgsForLogSubcommand } from "./logs.ts";
-import { assertEquals, assertThrows } from "jsr:@std/[email protected]";
+import {
+  assertEquals,
+  assertNotEquals,
+  assertThrows,
+} from "jsr:@std/[email protected]";
 import { parseArgs } from "../args.ts";
 
 Deno.test("parseArgsForLogSubcommand", async (t) => {
-  const parseHelper = (args: string[]) =>
-    // NOTE: We omit `logs` subcommand from the arguments passed to `parseArgs()`
-    // in order to match the actual behavior; the first positional argument is
-    // removed using `args._.shift()` in `deployctl.ts`.
-    parseArgsForLogSubcommand(parseArgs(args));
+  const parseHelper = (args: string[]) => {
+    // For this test, the subcommand name should not be included in `args`.
+    assertNotEquals(args.at(0), "logs");
+
+    try {
+      return parseArgsForLogSubcommand(parseArgs(args));
+    } catch (e) {
+      // Since Deno v1.44.0, when `Deno.exitCode` was introduced, test cases
+      // with non-zero exit code has been treated as failure, causing some tests
+      // to fail unexpectedly (not sure if this behavior change is intended).
+      // To avoid this, we set `Deno.exitCode` to 0 before giving control back
+      // to each test case.
+      // https://github.com/denoland/deno/pull/23609
+      // deno-lint-ignore no-explicit-any
+      if ((Deno as any).exitCode !== undefined) {
+        // deno-lint-ignore no-explicit-any
+        (Deno as any).exitCode = 0;
+      }
+      throw e;
+    }
+  };
 
   await t.step("specify help", () => {
     const got = parseHelper(["--help"]);