refactor: standardize Good First Issue label usage (hiero-ledger#2218)

Signed-off-by: Bhuvan Somisetty <somisettybhuvan5@gmail.com>

Author: bhuvan-somisetty

.github/ISSUE_TEMPLATE/00-good-first-issue-candidate.yml

@@ -82,7 +82,7 @@ body:
         - The complete steps to implement the solution
         - What the final result or output should look like
         - Links to relevant documentation or code (if helpful)
-        For good first issues, please keep this as guided and clear as possible.
+        For Good First Issues, please keep this as guided and clear as possible.
       value: |
         <!-- Identify what to change in which files -->
 
@@ -95,7 +95,7 @@ body:
     attributes:
       label: 🧠 Good First Issue Developers — Prerequisites & Expectations
       description: |
-        Adapt as needed. Concrete requirements before claiming this good first issue. Adapt as needed.
+        Adapt as needed. Concrete requirements before claiming this Good First Issue. Adapt as needed.
       value: |
         > [!IMPORTANT]
         > **This issue does not require prior domain knowledge.**

.github/ISSUE_TEMPLATE/01-good-first-issue.yml

@@ -69,7 +69,7 @@ body:
         - The complete steps to implement the solution
         - What the final result or output should look like
         - Links to relevant documentation or code (if helpful)
-        For good first issues, please keep this as guided and clear as possible.
+        For Good First Issues, please keep this as guided and clear as possible.
       value: |
         <!-- Identify what to change in which files -->
 
@@ -82,7 +82,7 @@ body:
     attributes:
       label: 🧠 Good First Issue Developers — Prerequisites & Expectations
       description: |
-        Adapt as needed. Concrete requirements before claiming this good first issue. Adapt as needed.
+        Adapt as needed. Concrete requirements before claiming this Good First Issue. Adapt as needed.
       value: |
         > [!IMPORTANT]
         > **This issue does not require prior domain knowledge.**

.github/ISSUE_TEMPLATE/02-beginner-issue.yml

@@ -98,7 +98,7 @@ body:
         > **Beginner issues are low-risk but we expect a working solution.**
 
         > [!IMPORTANT]
-        > We recommend completing at least 3 good first issues before attempting a beginner issue.
+        > We recommend completing at least 3 Good First Issues before attempting a beginner issue.
 
         **Difficulty:**
 
@@ -113,7 +113,7 @@ body:
         > - Keeping your fork up to date with main by [rebasing](https://github.com/hiero-ledger/sdk-collaboration-hub/blob/main/guides/issue-progression/for-developers/rebasing.md)
         > - Looking things up on your own before asking for help
 
-        If any of that feels unfamiliar, good first issues might still be the most rewarding path for you right now — [find one here](https://github.com/issues?q=is%3Aopen%20is%3Aissue%20org%3Ahiero-ledger%20archived%3Afalse%20no%3Aassignee%20(label%3A%22good%20first%20issue%22%20OR%20label%3A%22skill%3A%20good%20first%20issue%22)%20(repo%3Ahiero-ledger%2Fhiero-sdk-cpp%20OR%20repo%3Ahiero-ledger%2Fhiero-sdk-swift%20OR%20repo%3Ahiero-ledger%2Fhiero-sdk-python%20OR%20repo%3Ahiero-ledger%2Fhiero-sdk-js%20OR%20repo%3Ahiero-ledger%2Fhiero-website)).
+        If any of that feels unfamiliar, Good First Issues might still be the most rewarding path for you right now — [find one here](https://github.com/issues?q=is%3Aopen%20is%3Aissue%20org%3Ahiero-ledger%20archived%3Afalse%20no%3Aassignee%20(label%3A%22good%20first%20issue%22%20OR%20label%3A%22skill%3A%20good%20first%20issue%22)%20(repo%3Ahiero-ledger%2Fhiero-sdk-cpp%20OR%20repo%3Ahiero-ledger%2Fhiero-sdk-swift%20OR%20repo%3Ahiero-ledger%2Fhiero-sdk-python%20OR%20repo%3Ahiero-ledger%2Fhiero-sdk-js%20OR%20repo%3Ahiero-ledger%2Fhiero-website)).
         You can always come back when you are ready.
 
         ### ⚠️ AI Usage Policy

.github/scripts/bot-gfi-assign-on-comment.js

@@ -60,7 +60,7 @@ function commentRequestsAssignment(body) {
 }
 
 /**
- * Returns true if the issue has the good first issue label.
+ * Returns true if the issue has the Good First Issue label.
  */
 function issueIsGoodFirstIssue(issue) {
     const labels = issue?.labels?.map(label => label.name) ?? [];