fix(serde): handle raw % in README CSS without crashing export

[kabhishek1001]

Summary

• StringUtils.decodeContent calls URLDecoder.decode() on README descriptions during deserialization. When a README contains raw % in inline CSS (e.g. width:100%;), the decoder throws IllegalArgumentException — aborting the entire export with no partial output.
• Added a catch (IllegalArgumentException e) fallback to return the raw string as-is. Content that was never URL-encoded is already correct; valid %XX sequences are unaffected.
• Confirmed fix location via full call chain trace: AssetDeserializer.java:336 → StringUtils.java:96 → URLDecoder.decode() → IllegalArgumentException → caught at LiveAtlanResponseGetter.java:170 → raiseMalformedJsonError:266 → export exits with code 1.

Root Cause

AssetDeserializer.java:336 calls decodeContent() specifically for Readme type assets:

if (typeName != null && typeName.equals("Readme")) {
    builder.description(StringUtils.decodeContent(builder.build().getDescription()));
}

StringUtils.decodeContent (StringUtils.java:96) had no guard against IllegalArgumentException:

// Before
public static String decodeContent(String encoded) {
    return encoded == null ? null : URLDecoder.decode(encoded.replace("%20", "+"), StandardCharsets.UTF_8);
}

Fix

// After
public static String decodeContent(String encoded) {
    if (encoded == null) return null;
    try {
        return URLDecoder.decode(encoded.replace("%20", "+"), StandardCharsets.UTF_8);
    } catch (IllegalArgumentException e) {
        // README content may contain raw % in CSS (e.g. width:100%;) that was never
        // URL-encoded — return as-is rather than crashing the entire export
        return encoded;
    }
}

Test Plan

• Existing unit tests pass (./gradlew test)
• Verify decodeContent("width:100%; border-collapse:collapse; ") returns the raw string without throwing
• Verify decodeContent("hello+world%21") still returns hello world! (valid URL-encoded content unaffected)
• Verify decodeContent(null) returns null
• Run export workflow after deploying — confirm it completes without exit code 1

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